Vehicle-mounted battery box locking mechanism

The utility model relates to a vehicle-mounted battery box locking mechanism which comprises a battery box body (1), the bottom of the battery box body (1) is connected with a vehicle end bracket (2), the vehicle end bracket (2) is provided with a locking beam (3) and an automatic locking device (4) which are matched with each other, the automatic locking device (4) comprises a push rod motor (41), a connecting rod mechanism (42) and a spring bolt (43) which are sequentially connected, and the spring bolt (43) extends into a spring bolt seat (5). The spring bolt base (5) and the push rod motor (41) are both fixed to the vehicle end bracket (2), the spring bolt (43) is just arranged above the locking beam (3) when stretching out of the spring bolt base (5), and a position state sensor (6) is arranged below the connecting rod mechanism (42). The battery box locking device has the advantages that the structure is simple, the number of sensor judgment procedures is small, equipment cost is reduced, maintenance is