Mechanical wrench of bolt of sleeper

The utility model discloses a mechanical wrench of a bolt of a sleeper, which comprises a frame type land/track traveling mechanism, a mini internal combustion engine and a gearbox, a reversing control handle, a working sleeve and a sleeve operating mechanism, wherein the mini internal combustion engine and the gearbox are arranged on the frame type land/track traveling mechanism; the reversing control handle is connected with a reversing mechanism in the gearbox; the working sleeve is connected with a torque control mechanism of the gearbox; and the sleeve operating mechanism is connected on the frame type land/track traveling mechanism and acts on the working sleeve by a shifting fork. The gearbox adopts an aluminum alloy die-casting box body which is internally integrated with a power transmission mechanism, a speed-reducing mechanism, the reversing mechanism and the torque control mechanism, thus forming an integrated mechanism. The sleeve operating mechanism is a Z-shaped directly-connected shifting fork