Automatic tapping device

The invention relates to an automatic tapping device which comprises a first driving mechanism, a fixed base, a sliding base, a sliding rail mechanism and a tapping machine. The first driving mechanism is mechanically connected with the fixed base, the sliding base is mechanically connected with the fixed base through the sliding rail mechanism to achieve movement of the sliding base, and the first driving mechanism is in driving connection with the sliding base to achieve movement of the sliding base; the tapping machine is connected with the sliding base so that the tapping machine can move left and right. And the tapping machine comprises a second driving mechanism, a rotating shaft, a clamping telescopic mechanism and a screw tap, the second driving mechanism is in driving connection with the rotating shaft to achieve rotation of the rotating shaft, the clamping telescopic mechanism can stretch out and draw back and rotate along with the rotating shaft, and the rotating shaft drives the screw tap to rotat