The utility model discloses a dust electrometer treasure belongs to dust weight detection field. It includes casing, fan, anion generator, positive pole collection dirt piece, base, depression bar, the quick resistance of power, high pressure nozzle, casing one end is equipped with the air intake, is equipped with fan, anion generator, positive pole collection dirt piece in from the air intake to the casing cavity in proper order, positive pole collection dirt piece is fixed in depression bar one end, and the depression bar other end is fixed on the base through the activity of round pin axle, and the base is fixed in the casing, and depression bar middle part downside is equipped with the briquetting, and the quick resistance of doing all can is fixed on the base, is located the briquetting below, do all can quick resistance and briquetting contact. The particle action of gravity of accumulation down through the quick resistance of depression bar compression force, will detect out all with the detection circuitry of the quick ohmic connection of doing all can and adhere to particle weight, blow only through the particle of high pressure nozzle on with positive pole collection dirt piece, blow off by the air outlet to measure next time, depression bar top is fixed with the stopper, prevents that the depression bar from excessively swinging, damages inner structure.