Abstract: The device for measuring output error is simple in principle and with a low cost. It can meet most requirements of the measurement accuracy for the solar sensor. Its development is a sub-project of the project of the satellite dynamic simulator, as one of the important problems before the study and test of the satellite dynamic simulator, to measure the output error of the solar sensor. A design of the device is presented in this paper. It is based on the powerful ARM7 microchip controller. The high precision digital two-axis electric rotating platform is used to change the input angle. The ARM microchip controller is used to control the rotating angle and the rotating speed. A specific solar simulator is used as the light source of the solar sensor. The output angle of the solar sensor is transferred to the PC by the wireless URAT communication module. The error curve is obtained while comparing the changed angle of the rotating platform with the output angle from the solar sensor. The sources of the error of the device are reduced greatly. The main error sources are from the rotating platform and the solar simulator. The accuracy of the rotating platform reaches 0.001 25 mm per degree. The accuracy of the device can be in arcsec level if the surrounding is at a perfect state.