The invention discloses an external lock for an intelligent meter box, and belongs to the technical field of external locks for intelligent meter boxes. The technical problem to be solved is to provide the external lock for the intelligent meter box; the technical scheme adopted for solving the technical problem includes that the lock comprises a lock shell, wherein a lock core and a correspondingcontrol module are arranged inside the lock shell; a U-shaped lock rod is arranged at the top of the lock shell; one end of the U-shaped lock rod is a fixed end; the other end of the U-shaped lock pin is a locking end; the locking end of the U-shaped lock rod can move up and down in the lock core; a locking switch is arranged inside the lock core, and is in transmission connection with a lockingmotor; the control module is specifically a control circuit board arranged at the bottom of the lock shell; a central controller is integrated on the control circuit board; a signal output end of thecentral controller is connected with the locking motor; and the central controller is connected with a positioning module, a data storage module and an acousto-optic alarm module through conducting wires. The lock is mounted and applied to meter boxes.