The invention belongs to equipment for metal heat treatment and particularly relates to an automobile part quenching device. The automobile part quenching device comprises a quenching box, a heating box, an air feeding box and a flue gas processing box, wherein the heating box, the air feeding box and the flue gas processing box communicate with one another. The heating box is provided with valves. The air feeding box is internally provided with an air feeding channel and a sliding channel. The sliding channel is internally and rotatably connected with a rotary table, the rotary table is connected with a threaded rod in a threaded manner, and the threaded rod is fixedly connected with a workbench. The air feeding channel is internally and rotatably connected with a blade, first torsional springs are connected between the rotary table and the sliding channel. The rotary table is further rotatably connected with an air distribution disc, the air distribution disc is provided with an airinlet and an air outlet, and the air distribution disc is internally provided with a valve core for blocking the air inlet or the air outlet. The air feeding box is internally provided with a workpiece discharging slot, the workpiece discharging slot is formed between the sliding channel and the quenching box in a communicating manner, and the quenching box is further provided with a pipe communicating with the air feeding channel. By the adoption of the automobile part quenching device, the soot generated by oil quenching can be collected and processed, direct emission of the soot is reduced,and the automobile part quenching device is more environmentally friendly and is mostly used for oil quenching machining of automobile parts.