The invention discloses a composite base fertilizer for grapes. The composite base fertilizer comprises the following raw materials in parts by weight: 50-70 parts of fermented chicken manure, 14-22 parts of edible mushroom dregs, 20-26 parts of biogas digester dregs, 14-22 parts of fishbone dust, 16-24 parts of sunflower seed meal, 10-20 parts of monopotassium phosphate, 25-40 parts of ammonium nitrate, 20-28 parts of potassium fulvic acid, 20-40 parts of a kiln dust potassium fertilizer, 4-8 parts of carbonized coconut shell powder, 3-7 parts of sepiolite powder, 4-8 parts of kieselguhr, 1.5-2.5 parts of seashell powder, 4-8 parts of modified illite-montmorillonoid clay, 1-2 parts of fulvic acid diamine iron, 2-3 parts of fulvic acid manganese, 4-6 parts of traditional Chinese herbal medicine additives and 0.1-0.2 part of compound bacteria. The composite base fertilizer is balanced in nutrition and focuses on the mixing ratio of nitrogen, phosphorus and potassium, grapes can take nutrient components rapidly and sufficiently in different growth periods, normal growth of roots, leaves, flowers, fruits and the like of the grapes can be ensured, the yield of the grapes can be increased, the quality of the grapes can be improved, and the yield and the income can be increased.