Abstract: With the development of the power electronics industry, power equipment has become increasingly high-end and sophisticated, with higher and higher requirements for power quality, and the impact of voltage sags on equipment has become greater. Mastering the hazards of voltage sags to equipment and quantifying the impact of voltage sags on various sensitive equipment through experiments is an important basis for users to improve their voltage sag tolerance and take effective governance measures. Existing test schemes are based on manual reading of test results and manual drawing of sag tolerance curves. Based on the existing standard test items and test plans, this article comprehensively considers the characteristics of voltage sag, sensitive equipment types, sensitive equipment attributes, and load status, and proposes an automatic test method for voltage sag tolerance characteristics. The platform for programming the voltage source realizes the automatic generation of the voltage characteristic vector, the automatic test of the equipment, the automatic reset of the equipment, and the automatic drawing of the voltage sag tolerance curve, which greatly reduces the test time and labor costs.