The invention discloses a self-heating hat, and belongs to the technical field of clothing designing and processing. The self-heating hat comprises an outer-layer fabric, a heat insulation layer and an inner-layer fabric, and is characterized by further comprising a heat insulating film, wherein the heat insulating film is located between the outer-layer fabric and the inner-layer fabric; the heatinsulating film is combination of one or more of a dyeing film, a coating printing film, an ordinary metal film, a nanometer ceramic film, a precious metal film and a magetron sputtering film. The self-heating hat can reflect far infrared rays emitted by the head and make heat energy in the far infrared rays absorbed by the heat insulation layer in the hat, so that the temperature of the heat insulation layer is increased, and heat insulation of the head is conducted by sufficiently utilizing the heat energy of the head; the far infrared rays which are reflected back have the functions of heat insulation and health protection; the thickness of the heat insulating film between the outer-layer fabric and the inner-layer fabric is 0.3 millimeter, and the weight of the hat is hardly added; the heat insulating film is composed of several separate plate-shaped bodies, the separate plate-shaped bodies can be folded, and wearing comfort cannot be influenced.