A high-voltage switch power supply automatic testing platform has been designed to address the problems of numerous electrical performance indicators tests, complex testing processes, and low automation of testing methods. The platform features integration, high efficiency, self inspection, automatic testing, automatic recording, statistical analysis, automatic output of reports, and over limit alarm functions. This platform can configure testing parameters and processes through a software testing interface with human-computer interaction function, achieving one click multi process testing of multiple models of high-voltage switching power supplies. Experimental results have shown that the automatic testing platform for high-voltage switching power supplies meets all the testing requirements of three high-voltage switching power supply product specifications. The testing platform has high reliability, accuracy, safety, consistent testing data, and high testing efficiency. Compared with manual testing, the automatic testing platform for high-voltage switching power supplies improves testing efficiency by 42.4%.