Resetting device and method of special swim ring of automatic life-saving system for drowning in swim pool

The invention provides a resetting device and method of a special swim ring of an automatic life-saving system for drowning in a swim pool. The resetting device comprises a special swim ring, an inflating device and a fixing device, wherein a gas valve for inflating and deflating is arranged at the bottom of the right side of the special swim ring, and a magnet for being fixed at the bottom of the swim pool is arranged at the bottom of the swim ring; a pressure sensor of the inflating device is connected with an electromagnetic valve through a controller and is used for sensing the gas pressure of the special swim ring; an inflating nozzle is connected with an inflating pipeline; the inflating pipeline is connected with a high pressure gas tank through the electromagnetic valve; the high pressure gas tank is controlled by the electromagnetic valve and fills dry compressed gas into the special swim ring through the inflating pipeline; the fixing device comprises an electromagnetic lock; the electromagnetic loc