In order to promote the stable development of economy and avoid the risk of economic recession, the risk supervision of financial technology is very important. The traditional financial technology risk supervision methods are not comprehensive in risk early warning, and the accuracy of financial risk supervision is not high, which can not effectively supervise the financial technology risk. Therefore, this paper puts forward the supervision method of financial technology risk based on big data. This method obtains the performance index of financial risk by constructing the early warning system of financial technology risk; LSSVM financial technology risk calculation based on big data can minimize and maximize the structural risk. According to the structural risk, improve the classification and prevention of financial technology risk, and finally achieve the effective supervision of financial technology risk. Experiments show that: compared with the traditional methods, this risk supervision method has higher risk supervision efficiency, and can more effectively supervise the risks brought by financial technology.