The utility model relates to the technical field of material
cutting, in particular to a
building material cutting device. Comprising a
machining frame and a first driving motor, a drainage pipeline, a filtering box, a telescopic motor, a lifting rod and a
piston plate are connected to the lower portion of the
machining frame, a water collecting box, a water suction pump and a cooling
water pipe are welded to the outer side of the filtering box, and the first driving motor is installed on the outer side of the
machining frame; the output end of the first driving motor is connected with a sliding lead screw, a first sliding block, a clamping base, a
servo motor, a bidirectional lead screw, a second sliding block and a clamping plate. Cooling liquid generated during
cutting enters the filtering boxes through drainage pipelines to be filtered and then enters the water collecting box, a telescopic motor arranged above one filtering box pushes a lifting rod and a
piston plate to ascend or descend in the filtering process, the filtering boxes are controlled by an external single-
chip microcomputer to alternately work after the filtering boxes are used for a period of time, and the filtering efficiency is improved. And after the filter boxes are alternated, the cooling liquid continuously flows into the filter boxes, so that the alternated filter boxes can conveniently, reliably and quickly filter the cooling liquid.