This paper designs and implements a new generation switching power supply automatic test system according to the module architecture of the software-as-the-core. The new system can complete the function test of switching power automatically, save the test results, generate test report and make the statistical process analysis. The result of actual use shows that compared with the traditional switching power automatic test system, the new system has the advantages like short development cycle, low total cost, high throughput, good expandability, easy-to-upgrade and so on. It can meet the customer's requirements well.