The invention relates to an automatic feeding device in machine tool processing, in particular to a hollow car axle type part automatic feeding and water control device. The device comprises a machinerack, a guide rail, a gear and a rack driving mechanism, and the guide rail and the gear are mounted on the rack; and the device is characterized in that the machine frame can be lifted up and down,a water control device is arranged on one side of the machine frame, and a loading and unloading conveying device is arranged on the other side parallel to the water control device. The device can adapt to loading and unloading of workpieces with different diameters; the water control device is arranged on the other side of the lifting machine frame, a certain height difference is formed between the both ends of each workpiece, cutting fluid inside the processed hollow workpieces is controlled to be discharged and led back to equipment, and environmental pollution is reduced while resources are saved; and the loading and unloading conveying device and the water control device form two stations, the efficiency of loading and unloading and the efficiency of water control can be effectively improved, that is, recovery of the cutting fluid is achieved, and the production efficiency is increased.