The invention discloses a secondary fine grinding process for processing of sweet dumpling powder in the field of sweet dumpling powder processing, wherein the secondary fine grinding process comprises the steps of screening, cleaning, demildewing, soaking, pulp grinding, homogenizing, press filtration, crushing and drying. The pulp grinding includes primary pulp grinding and secondary pulp grinding, and glutinous rice pulp obtained from primary pulp grinding directly flows into a secondary pulp grinding machine by a stainless steel guide groove and is subjected to secondary pulp grinding; thesweet dumpling powder produced by the process is boiled into sweet dumpling with no turbidity of soup, no sticking to a basin, no sticking of teeth, good swelling, fineness, smoothness, softness, opalescent and bright color, obvious glutinous rice clear and fragrant taste, comfortable taste, high gelatinization degree, and good rehydration, and effectively solves the problems that the granularityof sweet dumpling powder is not fine enough and not conducive to eating.