The social service of higher vocational colleges is an inevitable choice of the great strategy of the Chinese modernization. From the perspective of system theory, the social service of higher vocational colleges under the Chinese modernization should be oriented to a wide range of social subjects in content design, and create a modern full-coverage vocational education service framework; should be oriented to wards internal and external integration in implementation, and construct a dynamic vocational education service model; and should take guiding social needs as a proactive measure in the feedback of results, and move towards high-quality development of vocational education service. However, there are still some mismatches in reality, such as lack of universality and diversification in content orientation, inadequate construction of the top-level design system and mechanism, and lack of systematic evaluation index system and high-quality development momentum. Therefore, we should optimize the social service of higher vocational colleges by creating a good internal and external field environment, establishing a service system under institutional guidance, enhancing the coordinated development of regional service capabilities, and building an evaluation index system for social service of higher vocational colleges.