Pile driver

The utility model relates to a pile driver which comprises a vehicle body, a frame body and a fixing structure, and the frame body is detachably connected with the vehicle body. Wherein the frame bodyis provided with a bottom plate and a pile hammer fixing frame, and the pile hammer fixing frame is arranged above the bottom plate; the pile hammer fixing frame is provided with a pile hammer and ahydraulic pump, and the hydraulic pump is used for driving the pile hammer to move so as to hammer a foundation pile into the ground. The bottom plate is provided with a limiting hole for the foundation pile to penetrate through; wheels enabling the pile driver to move are arranged on the bottom plate, the fixed structure comprises a fixed sleeve, a movable component, a driving mechanism and a soil drilling rod, the fixed structure is connected with the bottom plate through the fixed sleeve, and the movable component is arranged in the fixed sleeve and can extend out of the fixed sleeve through a bottom opening of the