Dust removing system

The utility model discloses a dust removing system, which comprises a dust hood (3), a dust remover (1), a blower (2) and a discharging chimney (9), wherein the lower part of the dust remover (1) is used for conveying dust to a dust storing device (7) through a dust conveying machine (6); and the dust removing system is characterized in that a pressure relief valve (10) is arranged at the negative pressure end of the blower (2) and the pressure relief valve (10) is arranged on the dust remover (1) or on the pipeline between the dust remover (1) and the blower (2). The pressure relief valve is arranged at the negative pressure end of the dust removing system, and when negative pressure reaches a set value, the pressure relief valve can open automatically to release the negative pressure, so that the equipment, namely the pipeline of the system, is protected from being damaged by the negative pressure.