With the full popularization and rapid development of Internet technology, Jiangsu small and medium-sized enterprises are facing great opportunities and challenges. The public technical service platform for small and medium enterprises can effectively respond to the needs of small and medium-sized enterprises and strive for necessary government resources when conducting corporate guidance. At the same time, for government agencies, relying on the platform's appeal and social relations is conducive to the effective publicity and promotion of government policies, so upgrading the public technology service platform for SMEs is the key to connect the government and enterprises. This paper breaks through the description of traditional technology service platform confined to geographic space, extends the technology service function to the Internet area, and introduces the “Internet +” concept and platform agglomeration theory to the upgrading and construction of public technology service platform of Jiangsu small and medium-sized enterprises.