In this paper, the real-time acquisition of angle encoding signal based on RTX is studied with inertial testing equipment as the object of application. In the design of inertial testing equipment control system, the design of angle encoder signal real-time acquisition is the key to realize the high-precision control of angular position and angular rate of inertial test equipment. Different from the method of poor openness and complex circuit based on hardware real-time acquisition, this paper carries out real-time acquisition based on RTX+Windows system platform. The hardware scheme and interface driver of real-time acquisition of angle encoder signal based on RTX are designed to realize the real-time acquisition of angular position of inertial testing equipment. The method is successfully applied to the real-time acquisition of the angular position of the turntable, and meets the real-time control requirements of the turntable.