Abstract: At present, detection error of pitch angle of roadheader is mainly compensated by manually controlling front blade and rear support of roadheader, the compensation range is very limited, and the efficiency, control precision and automation degree are low. In view of the above problem, mathematical model of pitch angle and actuator of boom roadheader were established, and the method was determined that adjusting position and posture of boom roadheader by using PID controller to control displacement of front shovel and rear support of the roadheader. AMESim was used to establish complete hydraulic model of actuator of the roadheader. The AMESim simulation shows that response time of the system is less than 3 s and the control error of hydraulic cylinder displacement is less than 2 mm, so the basic performance of the pitch angle control system is verified. The Simulink simulation results verify that the pitch angle control system has short response time, small tracking error, and good dynamic tracking performance.