The invention relates to a mechanical self-leveling express delivery trolley, comprising cargo, anti-skid pads, sensors, pressure-bearing foam boards, upper buffer outer springs, upper buffer inner springs, lower buffer outer springs, and lower buffer inner springs Spring, load plate, support plate, upper conical hole, lower conical hole, conical rubber pad, heavy hammer, set screw, adjusting nut, support frame, support baffle and carrier car, two upper and lower parts in the middle of the support plate The end is provided with an upper conical hole and a lower conical hole, a conical rubber pad is arranged in the upper conical hole, a heavy hammer is arranged in the conical hole, the bottom end of the heavy hammer is welded with the loading plate, and the upper end of the loading plate is provided with a heavy hammer. A fence, the cargo board supports the goods placed in the fence, and the lower end of the cargo board is provided with a sensor, which can measure the weight of the cargo and determine whether it is in the center of the cargo board. The advantages of the present invention are: the present invention utilizes the gravitational pointing action of the heavy hammer to realize the mechanical automatic leveling of the carrying trolley, which is simple and efficient.