This study investigates the switching, explosion, and chaos of multi-wavelength soliton states in ultrafast fiber lasers. The research focuses on the dynamic behavior of multi-wavelength soliton states in a negative dispersion passively mode-locked fiber laser. The generation of multi-wavelength soliton states involves a process of noise, oscillation, and stable mode-locking. Solitons with different group velocities collide, leading to soliton explosions. The soliton experiences relative phase oscillation, chaos, and oscillation before and after an explosion. The experiments and simulations show that increasing parameters related to pump power, single-soliton oscillation, multi-wavelength solitons, and chaos are observed, proving the relevance and reliability between simulation and experimental results. This work promotes the dynamical study of multi-soliton collisions in nonlinear science and the development of chaos theory in multi-comb lasers. Multi-wavelength fiber lasers have potential applications in optical communication networks, optical sensing, and photon calculations. However, the regulation and application of multi-wavelength states were mainly considered in triple-wavelength fiber lasers because of their complicated design and high cost. Internal soliton dynamics, particularly the transient dynamic behavior for state switching and collision of solitons, have been discussed less in triple-wavelength fiber lasers. Exploring the unknown behavior of soliton dynamics, such as the generation and collision of multi-solitons, will help improve the output performance of the triple-wavelength fiber laser, avoid the damage to the instrument caused by the transient behavior of solitons, and effectively enhance the usage efficiency of the laser and ensure the safety of the equipment. This paper mainly studies the transient switching and collision behavior of solitons in a triple-wavelength fiber laser. The process from the generation to annihilation of a multi-wavelength soliton state in a passively MLFL with negative dispersion is observed, and the transient dynamical behavior of the state switching from single-wavelength to double-wavelength and then to a triple-wavelength soliton state is revealed. In the multi-wavelength soliton state, multi-solitons with different GVs collide, causing periodic soliton explosions. Moreover, the process from the triple-wavelength soliton state to chaos is realized. The revelation of these internal dynamic behaviors is very helpful for understanding multi-wavelength MLFLs.This study investigates the switching, explosion, and chaos of multi-wavelength soliton states in ultrafast fiber lasers. The research focuses on the dynamic behavior of multi-wavelength soliton states in a negative dispersion passively mode-locked fiber laser. The generation of multi-wavelength soliton states involves a process of noise, oscillation, and stable mode-locking. Solitons with different group velocities collide, leading to soliton explosions. The soliton experiences relative phase oscillation, chaos, and oscillation before and after an explosion. The experiments and simulations show that increasing parameters related to pump power, single-soliton oscillation, multi-wavelength solitons, and chaos are observed, proving the relevance and reliability between simulation and experimental results. This work promotes the dynamical study of multi-soliton collisions in nonlinear science and the development of chaos theory in multi-comb lasers. Multi-wavelength fiber lasers have potential applications in optical communication networks, optical sensing, and photon calculations. However, the regulation and application of multi-wavelength states were mainly considered in triple-wavelength fiber lasers because of their complicated design and high cost. Internal soliton dynamics, particularly the transient dynamic behavior for state switching and collision of solitons, have been discussed less in triple-wavelength fiber lasers. Exploring the unknown behavior of soliton dynamics, such as the generation and collision of multi-solitons, will help improve the output performance of the triple-wavelength fiber laser, avoid the damage to the instrument caused by the transient behavior of solitons, and effectively enhance the usage efficiency of the laser and ensure the safety of the equipment. This paper mainly studies the transient switching and collision behavior of solitons in a triple-wavelength fiber laser. The process from the generation to annihilation of a multi-wavelength soliton state in a passively MLFL with negative dispersion is observed, and the transient dynamical behavior of the state switching from single-wavelength to double-wavelength and then to a triple-wavelength soliton state is revealed. In the multi-wavelength soliton state, multi-solitons with different GVs collide, causing periodic soliton explosions. Moreover, the process from the triple-wavelength soliton state to chaos is realized. The revelation of these internal dynamic behaviors is very helpful for understanding multi-wavelength MLFLs.