This paper provides a comprehensive review of the state-of-the-art constitutive models for frozen soils, which are crucial for understanding and predicting their mechanical behaviors in cold regions. Frozen soils exhibit significant differences in mechanical properties compared to unfrozen soils due to the presence of ice and phase changes. The study categorizes various constitutive models based on their underlying theories, including empirical, elastoplastic, viscoplastic, hypoplastic, binary element, hyperplastic, thermo-poromechanics, and damage mechanics models. Each category is discussed in detail, highlighting their advantages and limitations. The paper also outlines future research directions, emphasizing the development of open databases and unified constitutive models using advanced techniques. The review aims to facilitate research on the thermo-hydro-mechanical (THM) coupled processes in cold regions and promote a deeper understanding of frozen soil behavior.This paper provides a comprehensive review of the state-of-the-art constitutive models for frozen soils, which are crucial for understanding and predicting their mechanical behaviors in cold regions. Frozen soils exhibit significant differences in mechanical properties compared to unfrozen soils due to the presence of ice and phase changes. The study categorizes various constitutive models based on their underlying theories, including empirical, elastoplastic, viscoplastic, hypoplastic, binary element, hyperplastic, thermo-poromechanics, and damage mechanics models. Each category is discussed in detail, highlighting their advantages and limitations. The paper also outlines future research directions, emphasizing the development of open databases and unified constitutive models using advanced techniques. The review aims to facilitate research on the thermo-hydro-mechanical (THM) coupled processes in cold regions and promote a deeper understanding of frozen soil behavior.