In order to follow fast roof fluctuating of a face, improve response speed of an adjusting height system of a shearer cutting drum and prevent cutting roof which cause the damage of parts, an automatic adjustment height system of a shearer drum based on predictive control is established with the theory and method of predictive control. In the system, the coal-rock interface is predicted by means of historical data, a displacement of adjustment height cylinder is adjusted in real-time, to make the shearer cutting drum following the coal-rock interface. A simulation model of control system is constructed by the SIMULINK of MATLAB. Simulation results show that height of the shearer cutting drum can be anticipated in the system, the adjustment time is decreased by 0.25 s and overshoot is decreased by 4.8% than a conventional system. The system has sensitive response, small fluctuations and steady working .The increased of sampling point in predictive algorithm have decreased role to fluctuation and overshoot of height of the shearer cutting drum, but adjustment time increased.