Buoyancy enhancement type graphene electric heating heat preservation life-saving suit

A battery and a temperature controller are arranged on a life-saving suit body, the battery is a graphene magnesium seawater battery, a graphene flexible electrothermal film is clamped on the life-saving suit body, the battery is electrically connected with the graphene flexible electrothermal film through the temperature controller, and the temperature controller is electrically connected with the temperature controller. The graphene flexible electrothermal film comprises a left chest electrothermal film, a right chest electrothermal film, a left leg electrothermal film and a right leg electrothermal film; a piece of nylon waterproof cloth, an aluminum laminated film, a heat preservation foam layer and a nylon spinning lining are sequentially arranged on the life-saving suit body from the surface layer to the inside, a heat preservation cavity is formed between the heat preservation foam layer and the nylon spinning lining, and warp-direction supporting bodies and weft-direction supporting bodies which are c