The invention provides a granulating method for filling material powder of thermosetting plastic. The granulating method for the filling material powder of the thermosetting plastic comprises the following steps that (1) thermosetting plastic powder and required filling materials are mixed in a required proportion, and the material temperature is controlled to 0-5 DEG C; (2) a solvent and a surface active agent are added into the mixed materials in the proportion of 1%-10% after being mixed according to the ratio of 100:1 to 1000:1; and (3) the materials added with the solvent and the surface active agent are granulated, compacted, screened and dried. According to the granulating method for the filling material powder of the thermosetting plastic, in the granulating process, the materials are mixed through upper stirring paddles and then mixed again through a rotary mixing tray, afterwards, the raw materials pass through a baffle plate to be mixed for the third time through lower stirring paddles, and thus the requirement for continuous and uniform mixing is met. In the granulating process, deionized water and perfluoro caprylic acid ammonium salt are used as the solvent, consumption of the solvent is low, and the solvent is completely recovered in the drying process, so that the influence of the solvent on the environment is avoided, and the whole process is environmentally friendly.