Automatic lock catch

The invention relates to an automatic lock catch. The automatic lock catch comprises a base body, wherein a clamping surface which is attached to a lifting plate surface of a to-be-lifted object is arranged on the base body; a clamping crank arm is further hinged to the base body, the clamping crank arm is provided with a clamping part which moves towards the clamping surface in the swinging process so as to press the to-be-lifted object on the clamping surface, and the clamping crank arm further comprises a driving part used for enabling the clamping crank arm to rotate relative to the base body under the action of external force; a lifting part is arranged on the base body in a guiding and moving mode, the lifting part is in transmission fit with the driving part so as to drive the clamping crank arm to rotate relative to the base body when the lifting part is lifted and moves relative to the base body, and clamping fit with the clamping surface is realized; and the base body moves relative to the back lift