In order to solve the problem of excessively high dust concentration during the mining of the 8709 fully mechanized coal mining face in Jinhuagong Mine, it was found through field measurement and numerical simulation that the locations with high dust concentration were mainly within 10 m of the roller dust source and the downwind side of the dust source. Through research and design of 5 nozzles, air suction volume of 80 mm3 / min and a volume of about 0.1 m3, after the application of dust cutting device of coal cutter on site, the dust fall rate near the driver was?as high as 70%, with obvious dust removal effect, the technology ensured the normal mining operation of the working face.