The utility model provides a pneumatic dust collector, belongs to the field of underground coal mine dust falling, and aims to provide a device capable of reducing coal dust generated when coal is cuton an underground coal mine driving working face. Wherein the bottom of the shell is connected with the support frame; the drilling machine fixing plate and the bearing fixing plate are arranged on the two sides of an inner cavity of the shell. The air pipe connector and the water pipe connector are arranged at the top of the shell. The pneumatic drilling machine is arranged in an inner cavity ofthe shell and connected with the drilling machine fixing plate. An air inlet of the pneumatic drilling machine is connected with the air pipe interface; the bearing is arranged on the bearing fixingplate; one end of the transmission shaft is connected with a shaft hole of the pneumatic drilling machine, the other end of the transmission shaft is connected with the bearing, the impeller is installed at the other end of the transmission shaft and located beside the bearing, the sprayer is arranged in an inner cavity of the shell and connected with the water pipe connector, the protective net is arranged at the end, close to the bearing fixing plate, of the shell, and the sludge outlet is formed in the bottom of the shell.