Movable mechanical self-locking crane

The utility model discloses a movable mechanical self-locking crane. The device comprises a trolley, a pull rod, a frame, a hoisting nose, a manual pressing device, a first self-locking inclined rod,a second self-locking inclined rod, a connecting device, a first spring and a second spring, the lower end of the pull rod is vertically fixed on the trolley; a frame is sleeved on the pull rod; a lifting nose is fixed on one side of the frame; a manual pressing device is arranged in the other side of the frame; one end of the manual pressing device is hinged with the frame through a rotating shaft; the middle part of the manual pressing device is hinged with one end of a second self-locking inclined rod; the other end of the second self-locking inclined rod is sleeved on the pull rod; upwardself-locking is formed with the pull rod; a second spring is further installed between the second self-locking inclined rod and the frame, a first self-locking inclined rod is installed above the frame, the middle of the first