The invention relates to an underground coal mining tool for a coal mine, in particular to an underground absorption water jet cutting system of a coal mine, aiming to solve the technical problem of cleaning underground anchor cable locksets of the coal mine. The structure comprises a high pressure pump, an abrasive storage tank and a jetting device, wherein the high pressure pump is provided with three outlet pipe respectively linked with the tank top, the tank bottom of the abrasive storage tank and the jetting device; and the jetting device is connected with a spray gun and a cutting bracket via pipelines, the cutting bracket is composed of a tray with a magnet, the tray is provided with a U-shaped opening and is fixed with an auxiliary arm, the auxiliary arm is provided with a handle, a spray gun support is hinged on the U-shaped opening, and one end of the spray gun support is connected with the handle via a stay cord. The invention has convenient use, is safe and efficient, provides guarantee for underground safety production, and has broad application prospect in the underground safety production.