Cooling water filter of water exploration and drainage drilling machine

The utility model relates to the technical field of coal mine drilling, and particularly discloses a cooling water filter of a water exploration and drainage drilling machine. The upper end of the filtering sleeve is fixedly connected with the inner top face of the filtering cavity, a lead screw rotates between the inner top face and the inner bottom face of the filtering cavity, the filtering sleeve is sleeved with a functional ring in threaded connection with the lead screw, a cleaning brush used for stripping grit is arranged on the inner side of the functional ring, and a motor used for driving the lead screw is arranged on the filtering cavity. A drain pipe communicated with the filter sleeve is arranged at the top of the filter cavity, and one side of the filter cavity is communicated with a water inlet pipe. The bottom face of the filtering cavity is provided with a slag discharging opening, the slag discharging opening is slidably provided with a water plugging piston capable of plugging the slag disc