Abstract: An hair heating cap includes a cap body which is provided with a wearing chamber, a pocket and a zipper, wherein the pocket is opened or closed by the zipper, and the wearing chamber is provided for accommodating a user's head. A plug is disposed inside the pocket and electrically connected to a heater and a power supply unit, the heater gets power supply from the power supply unit to produce heat whereby to perform hair caring. The power supply unit is hidden in the pocket of the cap body, and the power supply unit supplies power directly to the heater, which makes the hair heating cap look neat and tidy, and the user is free to walk when wearing the hair heating cap without being restricted by the length of the power wire.