This article presents a tunable vanadium dioxide (VO₂) cavity system that enables multispectral manipulation across visible to microwave frequencies. The system uses a tandem Fabry–Pérot (F-P) cavity with selective-transparent layers to overcome wavelength dependence and achieve a highly integrated multispectral platform. Based on a typical phase change material, VO₂, the system demonstrates multispectral (400 nm to 3 cm), fast response speed (0.9 s), and reversible manipulation. The platform features tandem VO₂-based F-P cavities that allow independent customization of optical responses at target bands. It achieves broadband color-changing capacity in the visible region (resonant wavelength shift of ~60 nm) and can freely switch between three optical models (transmittance, reflectance, and absorptance) in the infrared to microwave regions with amplitude tunability exceeding 0.7. This work represents a significant advancement in multispectral optics and material science, offering a critical approach for expanding the multispectral manipulation ability of optical systems. The system's design involves a top VO₂/HfO₂/Si F-P cavity (TFP) for visible region color-changing and a bottom VO₂-based F-P cavity (BFP) for infrared to microwave region manipulation. The TFP structure enhances the permittivity change of VO₂ in the visible region, enabling reversible tuning of reflective color. The BFP structure uses a VO₂ layer as a reflector, allowing broadband manipulation of transmittance while maintaining resonant absorption in an F-P cavity. The system's performance is validated through simulations and experiments, demonstrating broadband color-changing capability, drastic transmittance tunability, and dynamic absorptance regions. The system also exhibits ultrafast response times and is capable of achieving high absorptance tunability. The results show that the system is the only reported one achieving multispectral and dynamic manipulation with ultrafast response speed based on phase change materials. The work highlights the potential of VO₂-based systems for advanced applications in memories, thermal management, imaging, and communications.This article presents a tunable vanadium dioxide (VO₂) cavity system that enables multispectral manipulation across visible to microwave frequencies. The system uses a tandem Fabry–Pérot (F-P) cavity with selective-transparent layers to overcome wavelength dependence and achieve a highly integrated multispectral platform. Based on a typical phase change material, VO₂, the system demonstrates multispectral (400 nm to 3 cm), fast response speed (0.9 s), and reversible manipulation. The platform features tandem VO₂-based F-P cavities that allow independent customization of optical responses at target bands. It achieves broadband color-changing capacity in the visible region (resonant wavelength shift of ~60 nm) and can freely switch between three optical models (transmittance, reflectance, and absorptance) in the infrared to microwave regions with amplitude tunability exceeding 0.7. This work represents a significant advancement in multispectral optics and material science, offering a critical approach for expanding the multispectral manipulation ability of optical systems. The system's design involves a top VO₂/HfO₂/Si F-P cavity (TFP) for visible region color-changing and a bottom VO₂-based F-P cavity (BFP) for infrared to microwave region manipulation. The TFP structure enhances the permittivity change of VO₂ in the visible region, enabling reversible tuning of reflective color. The BFP structure uses a VO₂ layer as a reflector, allowing broadband manipulation of transmittance while maintaining resonant absorption in an F-P cavity. The system's performance is validated through simulations and experiments, demonstrating broadband color-changing capability, drastic transmittance tunability, and dynamic absorptance regions. The system also exhibits ultrafast response times and is capable of achieving high absorptance tunability. The results show that the system is the only reported one achieving multispectral and dynamic manipulation with ultrafast response speed based on phase change materials. The work highlights the potential of VO₂-based systems for advanced applications in memories, thermal management, imaging, and communications.