With the development of supply chain finance, micro and small enterprises can effectively solve their financing difficulties and improve the flow of funds in the supply chain. This paper reviews the work done by past research in solving the financing problems of MSMEs, credit risk assessment and control, and the development of new technologies in supply chain finance. It discusses how technology affects the efficiency and security of supply chain finance and takes small and medium-sized enterprises as carriers to carry out a broader theoretical analysis of risk control and assessment. At the same time, the paper analyses the application of currently popular and advanced technologies, such as blockchain, artificial intelligence, and the Internet of Things, in solving the financing challenges of SMEs. In addition, the paper discusses and compares the risk assessment and control of micro and small enterprise financing and supply chain finance risk control and proposes corresponding solutions and models.