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Aiming at the problems of the existing relay protection tester such as cumbersome testing procedures, low degree of automation and low efficiency of point-to-point debugging, an automatic testing system of relay protection tester based on LabVIEW is proposed. In the system hardware, STM32F407ZGT6 is used as the main control chip to develop the output conversion device of the relay protection tester, and the automatic control tester and the standard are connected into the test circuit instead of the manual disconnecting and wiring behavior. With LabVIEW as the development platform, the system software has designed the modules of instrument communication, automatic detection, report generation, compulsory selection of measuring points, etc., and realized the automatic detection of the relay protection tester. By testing a type of relay protection tester, the results show that the system works stably, can realize one-click automatic detection, has a friendly user interface, can replace the cumbersome manual detection method, and has a certain engineering application prospect.