The invention discloses a special compound fertilizer formula for producing head cabbages by using ardealite-treated medical stones as a filler. White clays which are used as the filler by most of Chinese compound fertilizer production enterprises are replaced by the ardealite-treated medical stones as the filler. As ardealite having very strong acidity is used for treating silicate medical stones, a plurality of beneficial trace elements in the medical stones can be converted into water-soluble sulfate which is easily absorbed by crops, thus the fertilizer efficiency is improved and the cost of the formula per ton is reduced by more than 100 Yuan compared with the cost of a formula using the white clays as the filler. The special compound fertilizer formula is prepared by the following steps: mixing ardealite and medical stones in the ratio of 1:1 according to soil testing data and a 'cannikin law' principle of balanced fertilization; stacking for 3-5 days at normal temperature; then smashing 1.9-2.1 parts of filler, mixing the filler, 2.9-3.1 parts of urea, 1.9-2.1 parts of monoammonium phosphate and 2.9-3.1 parts of potassium chloride according to designed nutrients, and pelletizing; drying and packaging; and putting on the market for production, wherein the total nutrient of nitrogen, phosphorus and potassium in a compound fertilizer is 42% and the ratio of nitrogen to phosphorus to potassium is 16:8:18. Since being scientifically prepared based on soil tests, the formula has strong effectiveness. Many-year multi-site experiments prove that the yield of the head cabbages produced by applying a bag of the compound fertilizer per mu can be higher than that of the head cabbages produced by singly applying 3-5 bags of urea per mu.