Lifting overload protection device for ship unloader

The utility model discloses a lifting overload protection device for a ship unloader. The lifting overload protection device comprises a pressure sensor, a support seat, a torque arm, bearing support seats, an eccentric shaft and a pulley block, wherein the bearing support seats are respectively arranged at two ends of a shaft A of the eccentric shaft; the shaft A between the bearing support seats is fixedly connected with the pulley block through a key; a shaft B of the eccentric shaft is movably connected with one end of the torque arm; and the other end of the torque arm is movably connected with the support seats through the pressure sensor. Through the arrangement of the eccentric shaft, the force measuring position of equipment is transferred to the pulley block of pulleys from a wire rope reel, so that overhaul and maintenance are relatively convenient and simple; the operation of the equipment is relatively reliable; meanwhile, through an amplifying function of the torque arm, the model number of the pressure sensor is reduced; the sensitivity is improved; the cost is saved; and detection of the sensor is relatively accurate.