The invention discloses a brush friction torque ripple coefficient detection device and method of a torque motor, and belongs to the technical field of precision measuring instruments. The brush friction torque ripple coefficient detection device and method of the torque motor resolve the problems that an existing brush friction torque ripple coefficient detection device of the torque motor can not output data in real time and the detected data are low in accuracy. The brush friction torque ripple coefficient detection device of the torque motor enables a rotor of the torque motor to be detected to be fixed through a torque sensor, a lower computer enables a stator of the torque motor to be detected to rotate, the torque sensor collects data, the lower computer filters and amplifies the collected data, and then data calculation is achieved in an upper computer. The brush friction torque ripple coefficient detection method of the torque motor can accurately measure friction torque signals of a brush and the rotor of the torque motor to be detected and calculates and outputs a friction torque ripple coefficient of the brush and the rotor of the torque motor to be detected in real time. The brush friction torque ripple coefficient detection device and method of the torque motor are used for evaluating friction torque ripple of the torque motor.