Tunnel perforating machine

The invention relates to a tunnel perforating machine. The tunnel perforating machine structurally comprises an adjusting frame, an automatic drill rod arranged on the adjusting frame and an electrichammer arranged on the automatic drill rod. The automatic drill rod is made to move or rotate in any direction by adjusting the adjusting frame. The automatic drill rod comprises a height positioningrod connected with the adjusting frame. The height positioning rod is sequentially sleeved with a spring pressing device, a spring and a sliding main pipe. One end of the spring is connected with thespring pressing device, and the other end of the spring is connected with the sliding main pipe. The spring pressing device is located at the end, connected with the adjusting frame, of the height positioning rod. A plurality of positioning holes are formed in the upper surface of the height positioning rod in the axial direction of the height positioning rod. An upper limiting switch is arrangedon the sliding main pipe. A