Double drum linear type headstock gear. Relate to water conservancy machinery. Keeping reducing the service bridge width under the unchangeable prerequisite of original working property, compact structure improves the bearing capacity. Including frame, motor, reel no. 1, reel no. 2 and assembly pulley, the motor passes through support no. 1 and connects in the top of frame one end, the motor passes through the transmission of gear drive and reel and is connected, reel no. 1 and reel are connected the formation reel through the flange between two, the outer end of reel no. 2 is equipped with the back shaft, the back shaft passes through support no. 2 and connects at the top of the frame other end, the assembly pulley includes standing block, balanced pulley, running block and wire rope, the standing block is established in the frame, the bottom in the frame is established to balanced pulley, the below in the frame is established to the running block, wire rope's one end is connected reel no. 1, is twined with running block, standing block, balanced pulley, and reel no. 2 is connected to the other end. Improved the bearing capacity, used reliably.