The invention relates to an automatic chamfer turning lathe. The automatic chamfer turning lathe comprises a lathe body, motors, a beam, a lifting mechanism, a rough machining station, a chamfering station and a finish machining station, and is characterized in that the motors are arranged below the lathe body, the lifting mechanism is arranged on one side of the lathe body, the beam is arranged on the lathe body, the rough machining station, the chamfering station and the finish machining station are sequentially arranged at the portions, from one side of the lifting mechanism, below the beam, the chamfering station is internally provided with a driving device, and the rough machining station and the finish machining station are driven by the motor at the bottom of the lathe body. According to the automatic chamfer turning lathe, as the beam is in a double-track type, machining devices on the rough machining station, the chamfering station and the finish machining station are convenient to position; in addition, as the rough machining station and the finish machining station are driven by the motors arranged below the lathe body, the problem of the machining power can be effectively solved; as the directions of the two motors are opposite, the transmitting wiring problem caused when the motors are arranged in the same direction can be solved.