High-precision dust testing device adopting light scattering method

The utility model provides a high-precision dust testing device adopting a light scattering method. The high-precision dust testing device comprises an upper shell and a lower shell, a lower housing; comprising a first shell hinged to the upper shell and a second shell connected with the first shell. The laser unit is arranged on the upper shell; the blowback unit is arranged on the lower shell and comprises a first annular groove and a plurality of first blowback holes, the first annular groove is formed in the side wall of the first shell in the axial direction of the first shell, and the first blowback holes are formed in the inner side wall of the first shell; the second annular groove is formed in the side wall of the second shell and communicated with the first annular groove, the second blowback holes are formed in the inner side wall of the second shell, and the blowback connector is formed in the outer side wall of the second shell. And the discharge electrode and the polar plate are arranged between