The invention discloses a device for testing the characteristic consistency of a redundant sensor, and the device employs a synchronous belt drive mechanism. A sensor shaft is inserted into a semi-cylindrical compression spring assembly, and a sensor is fixed through a fixing compression spring. During manual rotation of a rotary knob, the rotation of a driving wheel is transferred to a driven wheel through a synchronous belt, and the driven wheel drives the sensor to rotate, and the sensor outputs a voltage signal. The device is used for testing the consistency degree of the characteristics of sensors of a space servo mechanism, and the sensors are grouped according to the difference of characteristics, thereby guaranteeing that a plurality of redundant sensors on the same servo mechanism are smaller in characteristic deviation. The device is simple and effective, is very convenient to install and disassemble, can test four sensors at the same time, employs manual drive, effectively improves the testing efficiency, and simplifies the testing process.