The Vocational Education Law and a series of rules and regulations on the reform and development of vocational education by the Party and the government have made provisions for the establishment of a third-party evaluation system for vocational education with Chinese characteristics. Third-party evaluation refers to the education quality evaluation activities carried out by non-governmental evaluation institutions，with the characteristics of independence，professionalism and credibility. The experience of third-party evaluation in the US，UK and Japan provides a reference for building the third-party evaluation system in China. At present，China’s vocational education third-party assessment system suffers from a lack of sound policy，slow institutional development，insufficient cultural support and weak theoretical guidance. To solve the problems，it is essential to set up the sound policy system，improve organizational capacity，promote internal and external linkage and strengthen theoretical research.