Abstract: Roadheader is the key equipment of coal mining. The efficient and stable work of roadheader contribute to improve the efficiency of coal mining.Aimed at the problems of coal seam characteristics of complicated and changeable, boom-type roadheader cutting coal with drastic load disturbance change. Constant power speed control system for roadheader based on fuzzy self-adaption with MCU is proposed. Fuzzy adaptive algorithm is used to speed adjustion of horizontal oil cylinder line speed and SIMULINK software is designed to verify simulation. The results show that the control system designed can adjust the the swing speed of cantilever according to coal and rock characteristics,the working efficiency of the roadheader is improved.