Perforating device

The utility model discloses a punching device which comprises a fixing cylinder, a punching motor is installed on the top of the fixing cylinder in a threaded connection mode, an output shaft of the punching motor is fixed to a rotating shaft of a punching rotary cutter through a coupler, the punching rotary cutter is movably installed in the fixing cylinder, and an inner cylinder is movably installed in the fixing cylinder. According to the perforating device, the bottom of a perforating rotary cutter is inserted into a ground soil structure, a perforating motor is pressed downwards at the same time, the depth of the perforating rotary cutter inserted into the ground soil structure is increased, soil at different depth positions in the ground soil structure can be sampled, and during perforating, a fixing disc covers the surface of the ground soil structure, so that the perforating efficiency is improved. The punching rotary knife can be limited and guided in the punching process, the situation that the punc