Automatic feeding device of numerical control lathe

The utility model discloses a numerical control lathe automatic feeding device which comprises an X-axis linear sliding rail, a tensioning sleeve, a centering sensor and lifting oil cylinders, the lifting oil cylinders are arranged at the four corners of the bottom of an adjusting seat, a supporting seat is arranged at the top of a piston rod of each lifting oil cylinder, one side of the supporting seat is provided with the tensioning sleeve, and the other side of the supporting seat is provided with the centering sensor. A pipe fitting is driven by the X-axis linear sliding rail to move in the X-axis direction, the pipe fitting is moved in the Y-axis direction by pushing the adjusting seat, and the pipe fitting is moved in the Z-axis direction by the upgrading oil cylinder, so that the center of the pipe fitting and the center of a chuck of a machine tool are located on the same straight line; the centering sensor is used for positioning, then one end of the pipe fitting is clamped through the machine tool c