A heating furnace for a press hardening process comprises: a cylindrical heating furnace main body in which an inlet for receiving a blank steel plate from a winding coil and an outlet for discharging the blank steel plate are respectively placed on the upper and lower portions thereof and a space capable of conveying the blank steel plate is prepared therein, a conveyor which is spirally arranged in the inner circumference of the heating furnace main body in order to successively convey the blank steel plate from the upper inlet to the lower outlet, and a clamping unit which is prepared in one side of the conveyor to selectively clamp the blank steel plate. According to the present invention, the length and space occupied by the facility are farther reduced than a linear heating furnace system so the available area of a plant can be increased. There is a useful effect that product quality is improved through uniform texture variation as a result of uniformly heating the entire region of the blank steel plate being conveyed during heating. In addition, the heating time for the blank steel plate being conveyed can be shortened by increasing the heated region and in that way, productivity is improved.