The utility model relates to pharmacy packing machinery, particularly a particle feeding microadjuster of an automatic capsule filling machine. The utility model comprises an adjusting seat with a material transfer passage, a manipulation comb and an adjusting comb, wherein the manipulation comb and the adjusting comb are arranged on the adjusting seat; the manipulation comb and the adjusting comb are matched to form a containing cavity for placing drugs; an adjusting component for controlling the capacitance of the drug containing cavity is also arranged on the adjusting seat, and the adjusting component and the adjusting comb form reversing and sliding matching. By the adjusting component, adjusting devices, such as original screws, etc., are replaced. Charging is adjusted in micro by trigonometric function value. The utility model has the advantages of simple and reasonable structure, high precision, stabilization and reliability, and simultaneously solves the problem of the inconvenience that an original regulating device needs to partially opening the equipment and is repeatedly disassembled and adjusted many times to turn exactly.