Stratum punching device for rock engineering

The utility model discloses a stratum perforating device for rock engineering, which comprises a main supporting pipe and a perforating assembly, a connecting pipe is fixed at the lower end of the main supporting pipe, a supporting disc is fixed at the lower end of the connecting pipe, four muddy water outlet grooves are arranged on the side edge of the supporting disc and the side edge of the main supporting pipe in a circular array mode, and the muddy water outlet grooves are communicated with the perforating assembly. A water supply pipe movably penetrates between the main supporting pipe and the connecting pipe, muddy water is conveniently discharged through the muddy water outlet groove, the muddy water enters a hole along with the main supporting pipe through the water supply pipe, the main supporting pipe does not need to be pulled out firstly and then fed into the water supply pipe, and therefore construction steps are reduced, and construction efficiency is improved. The punching assembly comprises a