The invention discloses a novel underground wet blasting machine of a coal mine. The wet blasting machine comprises a dispensing mechanism, a stirring mechanism, a pumping mechanism and an injection mechanism, wherein the dispensing mechanism, the stirring mechanism, the pumping mechanism and the injection mechanism are sequentially connected. The dispensing mechanism is a mechanism used for mixing raw materials, the stirring mechanism comprises a spiral stirring shaft; a spiral propelling movement blade and a stirring blade are arranged on the spiral stirring shaft, the pumping mechanism pushes and jets concrete to the injection mechanism, and the injection mechanism jets out the concrete under the action of compressed air after the concrete and a liquid accelerating agent are mixed. In the wet blasting machine, the spiral propelling movement blade and the stirring blade are arranged on the spiral stirring shaft, the continuous operation of stirring is realized, the stirring is more sufficient, and the stirring effect is ideal.