The invention discloses a steering wheel preheater which is characterized by comprising a heating element and an air guide ring, wherein the air guide ring is a 360-DEG annular rubber sleeve; an annular gap is formed in the inner ring of the sleeve; the internal diameter of the air guide ring is 3-5 cm smaller than the external diameter of a steering wheel, and the external diameter of the air guide ring is 1-5 cm larger than the external diameter of the steering wheel; an air inlet is connected to the outer edge of one side of the radial direction of the air guide ring; an air outlet is formed in the outer edge of the other side, opposite to the air inlet, of the radial direction of the air guide ring; the air inlet is connected with a cylinder communicated with the inside of the sleeve; the cylinder is internally provided with an aluminum alloy heat radiating fin on which a longitudinal air duct is arranged; the heating element is embedded in a main body of the heat radiating fin; the cylinder is connected with a rear shell which is internally provided with a fan close to the heat radiating fin; the fan is connected with a motor fixedly arranged on the rear shell; and an air hole is formed in a position, close to the motor, on the rear shell. The steering wheel can be rapidly heated through hot air flows, so that comfort and safety are brought for driving.