A warming blanket includes a warm-air generator, a blanket unit, an air-providing tube and a returning tube. The warm-air generator includes a blower that has an air inlet for drawing air, and a heating member for heating air. The blanket unit has first and second air channels. The warm air which is heated by the heating member is transmitted into the first air channel through the air-providing tube, flows through the first and second air channels, and is transmitted back to the air inlet of the blower.
