The invention discloses a method for producing ammonium fluoride by recovering fluorine resources. The method comprises the following steps of: dissolving fluorine-containing silicon dregs and ammonium fluoride at the temperature of between 95 and 108 DEG C to obtain a transparent ammonium fluosilicate solution, cooling, introducing ammonia gas until the pH value is between 9.0 and 9.8, precipitating to separate white carbon black out, filtering to obtain a white carbon black solid and an ammonium fluoride solution, and returning the ammonium fluoride solution according to the quantity required by reacting with silicon dregs; mixing the residual ammonium fluoride solution with a mother solution formed by crystallizing ammonium fluoride, and concentrating the mixture in a concentration device until the mass concentration of the ammonium fluoride is between 60 and 80 percent; conveying the ammonium fluoride into a cooling crystallizer, cooling and crystallizing for 4 to 7 hours, and precipitating ammonium fluoride crystals to obtain an ammonium fluoride solid-liquid mixture; and filtering and separating the ammonium fluoride solid-liquid mixture to obtain the ammonium fluoride crystals. By the method, the concentration of the ammonium fluoride can be improved, the energy consumption in the concentration process can be reduced, fluorine in the fluorine-containing silicon dregs is recovered, phosphorite associated fluorine resources are utilized fully, and the pollution of the fluorine-containing silicon dregs to environment is reduced.