The utility model provides a hydraulic driving system of incinerator stirring fire grate, the system includes the pneumatic cylinder, be provided with the piston rod in the oil pipe barrel of pneumatic cylinder and set up in the piston of tailpiece of the piston rod portion, the head of piston is provided with the throttle sleeve, the afterbody of piston rod is provided with the throttle valve shaft, oil pipe barrel head is provided with oil through and throttle oil through with oil cylinder head portion oil pipe interface intercommunication, oil pipe barrel afterbody is provided with the throttle valve disc, be provided with return stroke oil through and return stroke throttle oil through with hydro -cylinder afterbody oil pipe connector intercommunication on the throttle valve disc, thethrottle sleeve can the drive of piston rod is blockked up down the oil through, the throttle valve shaft can the drive of piston rod gets into down the throttle valve disc is sealed totally the return stroke oil through. According to the utility model provides a hydraulic driving system of incinerator stirring fire grate can alleviate the impact to equipment, prolongs the life of equipment.