Vehicle battery replacing device and battery replacing system

The embodiment of the utility model provides a vehicle battery replacing device and a battery replacing system. The vehicle battery replacing device is used for replacing a battery assembly (41) of a vehicle (40), and comprises a walking chassis (10); the locking and unlocking platform (20) is arranged on the walking chassis (10); the suspension mechanism (50) is connected with the locking and unlocking platform (20); and the lifting mechanism (30) is arranged on the walking chassis (10), is connected with the locking and unlocking platform (20) through the suspension mechanism (50) and is configured to drive the locking and unlocking platform (20) to ascend and descend.