Automatic sampling device of particle size analyzer

The utility model discloses an automatic sampling device of a particle size analyzer, and relates to the technical field of automatic sampling of particle size analyzers. A sample bin is arranged at the upper end of the rack, and a detection barrel is arranged at the lower end of the rack; the sample injection assembly comprises a burette, an automatic valve, a first storage tank, a second storage tank and a conveying part, the burette is mounted at the bottom of the sample bin, the automatic valve is mounted on the burette, a lower inner cavity of the first storage tank is communicated with the sample bin through a guide pipe, and the second storage tank is communicated with an upper inner cavity of the sample bin through the conveying part; the burette disclosed by the utility model has the beneficial effects that the burette automatically discharges liquid, manual suction operation is not needed, the operation speed is high, the filler quantification is accurate, the secondary precipitation phenomenon is a