In order to solve the problems of the small satellite magnetic polarity test in the whole satellite integrated test stage, such as many personnel involved, the test process is cumbersome, and the test results can not be quantified, an automatic test system for the small satellite magnetic polarity is designed and proposed to realize the efficient detection and data interpretation of the magnetic torque converter polarity; The overall idea of the system design is to introduce the Hall magnetic induction sensor and a test system built on a miniature single board computer into the satellite magnetic torque converter polarity test, replace the original test tools and methods, send test commands to the satellite via the standard network and test communication protocol control master software, and intelligently interpret the test commands, test results, and associated telemetry, thus achieving an automated test closed-loop; The system creates a new control component test mode that integrates command sending, test implementation, telemetry data interpretation and sending functions, providing a good test design idea for the future small satellite R D and production gradually moving from traditional mode to mass production mode.