In order to fundamentally solve the hidden danger of dust explosion in grain silos, a new fully hydraulic intelligent screw clearing machine for grain silos was studied. The rotation of the spiral shaft and the movement of the whole machine were controlled by the hydraulic system, which realized that there was no electrical component in the internal actuator and the safety was higher. This paper introduces the structure and composition of the fully hydraulic intelligent screw clearing machine for grain silos and studies its key technologies. Based on the above achievements, the first domestic fully hydraulic intelligent screw clearing machine for grain silos is developed and applied to the grain silos of Xiamen Port Hailong Wharf. The application further compares and analyzes the main performance parameters of the fully hydraulic intelligent screw clearing machine and the electric screw clearing machine for grain silos. The research shows that the fully hydraulic intelligent screw clearing machine for grain silos can effectively reduce the operation of personnel entering the warehouse and realize safer, intelligent and efficient clearing operations.