The invention discloses an automatic winding device for a power grid and a using method thereof. The automatic winding device comprises a base, wherein wheels are arranged at the four corners of the bottom of the base, a protective cover with an opening formed in one side is fixedly mounted at the top of the base, a door plate is rotationally connected into the protective cover, a supporting plateis slidably connected to the top of the base, a limiting frame is fixedly installed on one side of the top of the supporting plate, a connecting frame is slidably connected to the limiting frame, theconnecting frame is rotatably connected with one side of the door plate, a supporting ring is rotatably connected with one side of the protective cover, a pressing rod is slidably connected with oneside of the protective cover, the pressing rod and the supporting plate are movably clamped, the supporting ring is in transmission connection with the pressing rod, and one side of the supporting ring is in sliding connection with a moving frame. According to the automatic winding device, the power grid can be automatically wound, stored and moved, so that the power grid can be effectively protected, the power grid can be prevented from being damaged, and good use stability and convenience are achieved.