Mechanical arm for loading and unloading containers

The utility model discloses a cargo box loading and unloading mechanical arm which comprises a movable frame and a mechanical arm body arranged at the top of the movable frame, the mechanical arm body comprises a seat plate, the top of the seat plate is connected with a second hinge seat, the second hinge seat is hinged to a main supporting arm, and one end, away from the second hinge seat, of the main supporting arm is hinged to an auxiliary supporting arm. One end, away from the main support arm, of the auxiliary support arm is slidably connected with an extension arm; a third hydraulic rod for controlling the extension length of the extension arm is arranged in the auxiliary support arm; the mechanical arm is designed according to existing requirements, the mechanical arm body can be conveniently detached from the movable frame, use is flexible, the mechanical arm is convenient to move and use when installed on the movable frame, or when the mechanical arm is installed on a truck, cargo boxes can be loaded