Using blockchain technology to improve the information collaboration efficiency of flexible multi-agent employment has great significance to balance the supply and demand of the labor market. Firstly, the current situation and problems of flexible employment is analyzed, and it is found that the characteristics of the blockchain technology are highly compatible with the flexible employment. Then, based on the characteristics of blockchain technology, and combining with the feature of flexible employment, the 4 kinds of blockchain architecture are constructed. According to the cross-chain technology of blockchain, a heterogeneous blockchain network with flexible employment information collaboration is constructed. The application of blockchain technology can effectively improve the information collaboration in the field of human resources, solve the problem of difficult selection and retention, ensure the transparency and legitimacy of flexible employment, and contribute to the healthy, efficient and legal development of labor market.