This review article focuses on the wet-spinning process of carbon nanotube fibers (CNTFs), a promising material with excellent mechanical, electrical, and thermal properties. The wet-spinning technique is highlighted as a scalable method for producing CNTFs, compared to other methods like array spinning and direct dry spinning. The article begins by describing the wet-spinning process, including the preparation of high-concentration CNT dispersions and the solidification of filaments during coagulation. Non-covalent adsorption and charge transfer mechanisms are discussed in detail, emphasizing the importance of maintaining the integrity of CNTs' sp2 backbones. Post-treatment processes such as drafting and thermal annealing are also covered, along with their impact on enhancing the alignment and compactness of CNTFs. The relationship between physical properties and structure is explored, providing insights into optimizing CNTFs for various applications. The article concludes with perspectives on scaling up the production of high-performance CNTFs and their potential impact on future technologies.This review article focuses on the wet-spinning process of carbon nanotube fibers (CNTFs), a promising material with excellent mechanical, electrical, and thermal properties. The wet-spinning technique is highlighted as a scalable method for producing CNTFs, compared to other methods like array spinning and direct dry spinning. The article begins by describing the wet-spinning process, including the preparation of high-concentration CNT dispersions and the solidification of filaments during coagulation. Non-covalent adsorption and charge transfer mechanisms are discussed in detail, emphasizing the importance of maintaining the integrity of CNTs' sp2 backbones. Post-treatment processes such as drafting and thermal annealing are also covered, along with their impact on enhancing the alignment and compactness of CNTFs. The relationship between physical properties and structure is explored, providing insights into optimizing CNTFs for various applications. The article concludes with perspectives on scaling up the production of high-performance CNTFs and their potential impact on future technologies.