The utility model discloses a battery case unlocking device which comprises an operating rod and a push-pull rod of which one end is fixed on the side wall of the operating rod; a push-pull disc used for extending into a lock head to be clamped and matched with a plug is fixed at the tail end of the push-pull rod; and a handle is fixed at the rear end part of the operating rod, and the front end of the operating rod has a supporting structure used for being propped against, and pressed and matched with a battery case. The battery case unlocking device has the beneficial effects that when the battery case unlocking device is in use, the supporting structure is propped against, and pressed and matched the battery case; as the supporting structure is taken as a supporting point, an operator wrenches the operating rod through the handle to drive the push-pull disc to prop against and push the plug in the lock head, thereby unlocking the battery case; and the operation is convenient and quick, and the structure is simple.