Aiming at the problem of financing risk in bulk commodity trading platform, this paper analyzes and discusses the supply chain financial financing game under the traditional trading platform. Combined with the technical characteristics of blockchain, such as immutability and process transparency, this paper establishes the supply chain financial financing game model of blockchain trading platform, and uses MATLAB for simulation analysis. The results show that the application of blockchain technology can optimize the financing model of the traditional trading platform, break the "information island" among the enterprise, reduce the risk of financing, and establish a more secure supply chain financial financing platform. On the blockchain platform, enterprise financing is related to the stable income, credit accumulation and fines of the supply chain. By increasing the stable income and credit accumulation and setting a reasonable number of fines, the evolutionary game can achieve the optimal strategy.