Abstract: In this paper, the space temperature environment is simulated by the temperature change test, the thermal cycling test and the aging test. The magnetic moment and the winding resistance of the magnetorquer are measured by the working performance monitoring system. Test results show that different temperature environments, the hot and cold cycle time and the number of cycles, will have an impact on the working performance of the magnetorquer. Besides, the working performance of the magnetorquer in the space temperature environment is related to the magnetic core rod material.