The invention relates to the field of hot galvanizing furnaces, in particular to a hot galvanizing furnace. The hot galvanizing furnace comprises a heating furnace with an upper end arranged in an opening shape. A lifting mechanism is located at the position above the heating furnace. A driving mechanism is fixedly installed at the center position of the upper surface of the lifting mechanism. A placement mechanism is fixedly connected to the position, corresponding to the heating furnace, of the lifting mechanism. Firstly, a machined piece is placed on the carrying mechanism, the driving mechanism is used for driving the lifting mechanism, the lifting mechanism drives the carrying mechanism to lower the machined piece into the heating furnace, when the upper surface of a supporting rod islower than the upper surface of a carrying frame, the machined piece can be placed on the carrying frame to be subjected to galvanizing, galvanizing can also be conducted on a fixed part of the machined piece, the supporting rod is lifted to lift the workpiece out of the heating furnace after galvanizing is completed, when the machined piece is lifted, contact between the machined piece and the carrying frame is released, the contact position of the machined piece and the carrying frame can be subjected to galvanizing, and the galvanizing work of the machined piece is completed simply and conveniently.