The invention provides a smart lock which comprises a front lock body, a rear lock body, a lock body and metal connecting pieces. The lock body is mounted on a door, and the metal connecting pieces mounted above and under the lock body to have the front lock body and the rear lock body connected are electrically connected with a power supply; the front lock body and the rear lock body are mutually connected through the metal connecting pieces so as to have the power supply between the front lock body and the rear lock body connected. By the arrangement, connecting wires can be reduced.