The present invention provides a power plug, comprising a main shell, a first sub shell, a second sub shell, a third sub shell, a first pin, a second pin, a third pin, a first conductive bearing and a second conductive bearing. In the power plug of the present invention, the first pin can rotate 360 degrees along an axial center line thereof, the second pin can rotate 360 degrees along an axial center line thereof, and the third pin can be stored in a groove after rotation. When a three-pole flat type plug faces a two-pole socket, the first pin and the second pin are rotated to angles matched with the two-pole socket, and the third pin is stored in the groove, then the three-pole plug is smoothly inserted into the two-pole socket, thereby solving the problem that the three-pole flat type plug cannot be inserted into the two-pole socket, and improving practicality of the power plug.