The invention discloses a preparation process for astragalus superfine powder particle decoction pieces, comprising the following steps that S1, cleansing: Chinese herbal medicine raw material, namely astragalus, is subjected to impurity removal and is cleanly washed; S2, the astragalus is cut into slices; S3, the astragalus is dried until the water content is 3-8 percent; S4, low-temperature superfine grinding is carried out at the temperature of minus 50 DEG C to minus 20 DEG C until the granularity is 100-1000 meshes; S5, mixing is carried out; S6, palletizing is carried out, and the granularity of prepared particles is 12-24 meshes; S7, blending is carried out; and S8, weighing and packaging are carried out. The preparation process for the astragalus superfine powder particle decoction pieces has the beneficial effects that no excipients are added, all natural features of the Chinese herbal medicine are effectively remained, the dissolving-out speed and dissolving-out quantity of active ingredients are improved, the advantage of common decoction and taking of traditional Chinese medicament is maintained, the synergistic effect of various formulas of Chinese herbal medicine decoction pieces is played, the curative effect is improved, the identity of product quality and active ingredient content of particles is strong, and the implementation of mechanical, large-scale and batch production is facilitated.