Abstract: Tank turret rotation angle measurement accuracy relative to the chassis directly determines the precision of the stable sighting system and the inertial navigation system. At present, the main battle tank equipped with a tank turret in the angle measurement device which has low measurement accuracy relative to the chassis can solve the problem of steering the tank body only. This paper proposed a high-precision angle measurement device which was composed of location and orientation system, mechanical drive system and resolver. It firstly introduced the working principle and work process, followed by the angle measuring device calibration and the theoretical analysis of error, the final joint commissioning proved this angle measuring system met the actual demand. Results indicate that this measurement system can confirm the location when instantaneously powered and has absolutely zero memory function, the angular accuracy is 42.