Movable mechanical self-locking crane

The invention discloses a movable mechanical self-locking crane. The movable mechanical self-locking crane comprises a trolley, a pull rod, a framework, a lifting nose, a manual pressing device, a first self-locking diagonal rod, a second self-locking diagonal rod, a connecting device, a first spring and a second spring, wherein the lower end of the pull rod is vertically fixed on the trolley; theframework sleeves the pull rod; the lifting nose is fixedly arranged on one side of the framework; the manual pressing device is arranged in the other side of the framework; one end of the manual pressing device is hinged to the framework through a rotating shaft; the middle part of the manual pressing device is hinged to one end of the second self-locking diagonal rod; the other end of the second self-locking diagonal rod sleeves the pull rod and forms upward self-locking with the pull rod; the second spring is also arranged between the second self-locking diagonal rod and the framework; thefirst self-locking diagon