The invention discloses a multicategory-impurity signal fluorite ore dressing method which comprises the following steps of: in the first stage, carrying out primary size mixing on monomer ore pulp obtained in a grading way by using an alkaline regulating agent so as to enable clay to separate from the surface of mineral and disperse in the ore pulp evenly and stably, adding collector alkaline oleic acid, and removing impurities mainly containing clay by 1-3 level flotation; in the second stage, carrying out secondary size mixing on the treated pulp in the first stage by using an acidic regulating agent, adding collector neutral oleic acid, and removing impurities mainly containing mica by 1-5 level flotation; and in the third stage, carrying out three-level size mixing on the treated pulp in the second stage by using an acidic size mixing agent, adding collector acidic oleic acid, and removing impurities mainly containing carbonate by 1-5 level flotation to obtain concentrate 97-99 percent of which are qualified. The multicategory impurity signal fluorite ore dressing method can create different ore dressing environments according to impurity categories and properties, carry out segmented restriction and sorting on the mineral, achieve the aim of removing different impurities and finally obtain qualified target concentrate.