In response to the difficulty of achieving precise control of the rapid excavation system due to the physical properties of coal and rock tunnels, and the phenomenon of load fluctuations and impacts caused by the cutting process on the system, the return air roadway of the 11181 working face in Juxin Coal Mine is taken as the research object. The cutting motor current of the rapid excavation system is used as the feedback signal, and the fuzzy sliding mode variable structure method is used to control the nonlinear electro-hydraulic control system with constant power. The real-time adjustment of the cutting section's lateral speed is carried out and on-site application analysis is carried out. The research results show that compared to the fuzzy PID control method, the control method based on fuzzy sliding mode variable structure can keep the lateral swing speed of the cutting part of the system stable, have better speed tracking effect, and the cutting power fluctuation is only 2.81% of the rated power; Through on-site application analysis, it has been found that the fuzzy sliding mode variable structure control method can reduce the power fluctuation of the cutting system, maintain constant power operation of the cutting system, and further improve the control accuracy and stability of the rapid excavation system when the coal rock hardness suddenly changes.