A padlock mechanism of an electrically operated device comprises an operation handle (1), a padlock (2) and a state switching toggle (3), the handle (1) is mounted on a rotating shaft (4) and can rotate around the rotating shaft (4), and the padlock mechanism is characterized in that the padlock is mounted on an installation shaft (5) and can rotate around the installation shaft (5), in the anticlockwise rotation process, one end of the padlock (2) can abut against a limiting step (101a) extended out of a rotating disk (101) of the handle (1) to lock the limiting step, and the padlock (2) canbe departed from the limiting step (101a) to unlock the limiting step in the clockwise rotation process. The padlock mechanism realizes padlock of the electrically operated device via rotation, the handle of the device is prevented from misoperation during maintenance, and it is ensured that the padlock cannot be pulled out during automatic control of the electric operation mechanism.