The invention discloses a heat treatment device for engraved lines of a metal shell of an intelligent door lock. The heat treatment device for the engraved lines of the metal shell of the intelligent door lock comprises a base plate. Fixed seats are arranged on the base plate. Side plates are arranged on the two sides of each fixed seat. A top seat is arranged between the ends of every two corresponding side plates. A heat treatment quenching chamber is arranged between the top seats. A ceramic plate is arranged on the top of the inner side of the heat treatment quenching chamber. A plurality of sensors are arranged on the ceramic plate. A quenching machine is arranged on the top of the heat treatment quenching chambers. The quenching machine is electrically connected with the sensors. Air cylinders are arranged on the fixed seats. The upper portions of the air cylinders are provided with telescopic shafts. Guide pipes are arranged on the top seats. Lifting pipes are arranged inside the guide pipes in a sleeved manner. The lower end of each lifting pipe is connected with the corresponding telescopic shaft. The upper end of each lifting pipe is provided with a lock plate made of a ceramic material. Side seats are arranged on the top seats. Limiting plates are arranged at the ends of the side seats. Each limiting plate and the corresponding lock plate are parallel. According to the heat treatment device for the engraved lines of the metal shell of the intelligent door lock, the sensors enable the local part of the surface of the metal shell of the intelligent door lock to be heated through a high-frequency current, and therefore the heat treatment efficiency is greatly improved.