The invention belongs to the technical field of mechanical power, and particularly relates to a hydraulic machine. According to the technical scheme, a torque outputting hydraulic device comprises a hydraulic cylinder, a ball screw, a front end plate, a rear end plate, a sliding sleeve and a connection block; liquid is introduced into the hydraulic cylinder, and the oil liquid pushes a cylinder barrel to move left and right due to the fact that a piston rod is fixed; after a bite block arranged outside the cylinder barrel is connected with a connection block, a sliding block is pushed to do rectilinear motion; and the sliding block is matched with the screw, the sliding block does rectilinear motion to drive the ball screw to rotate, and torque is transferred out through the ball screw. According to the torque outputting hydraulic device, the conventional hydraulic cylinder is used as a power source, a ball screw pair is driven to work to output torque, the torque can be adjusted according to the cylinder diameter, the rod diameter and oil pressure, the number of rotating circles can be adjusted by changing the stroke of the hydraulic cylinder and the lead of the ball screw, the ball screw is used as a transmission pair, rotation is flexible, the output efficiency is improved, and maintenance is convenient.