The invention discloses a compound aquasorb fertilizer special for flax. Effective elements in the aquasorb fertilizer comprises, by weight of pure nutrients, 14.30% of nitrogen, 11.51% of phosphorus pentoxide and 0.88% of potassium oxide. The aquasorb fertilizer has the advantages of a reasonable nutrient proportion which is in accordance with the nutrient absorption regulation of the flax and a high utilization efficiency of fertilizer, and is capable of evidently promoting growth and development of the flax, increasing output of the flax grains, improving nutrient quality of the flax, and lessening undesirable effects on environment due to inappropriate application of nitrogen fertilizer, thereby providing production of compound fertilizer special for dry-land flax in a local district and districts of the same kind with scientific formulas, realizing the scientization, rationalization, normalization, systematization of flax fertilization, completing the scientific fertilization technique at one stroke to further increase fertilizer utilization efficiency of dry-land flax.