NOVELTY - Transforming distilled spirit loss meal housefly larva into fertilizer, comprises e.g. collecting and cleaning a housefly larva, feeding the 5 generations of larva into milk powder and sugar to domesticate a stable propagation property, inducing culture of housefly larvae in a culture medium using grains, increasing the grain culture material to obtain the distilled spirit loss grain for transformation, fermenting the distilled spirit loss grain, then adding alkaline substance to adjust the pH value of the solution to be 6.5-7, and obtaining the distilled spirit loss grain modified primer.    USE - The method is useful for transforming distilled spirit loss meal housefly larvae into a fertilizer.    ADVANTAGE - The method is capable of accurately transforming the distilled spirit loss meal housefly larvae into fertilizer with high quality and without environmental pollution.    DETAILED DESCRIPTION - Transforming distilled spirit loss meal housefly larva into fertilizer, comprises collecting and cleaning a housefly larva, feeding the larva into milk powder and sugar to domesticate a stable propagation property, inducing culture of housefly larvae at an environment temperature of 20-30 degrees C and a relative humidity of 60-80% in a culture medium using grains, where the culture medium has a water content of 50-80% and a weight ratio of spent grain and a wheat bran is 1:9, increasing the grain culture material to 5-20 to obtain the distilled spirit loss grain for transformation, fermenting the distilled spirit loss grain at a temperature of 65 degrees C for 1-2 days, adding alkaline substance to adjust the pH value of the solution to be 6.5-7, obtaining the distilled spirit loss grain modified primer, uniformly mixing 60-80 wt.% of primer, 15-30 wt.% of wheat bran or bran or bagasse and 2-10 wt.% of protein material to prepare a fly maggot protein charge, placing the industrial fly maggot protein charge in a bottom end of a random packet, performing genetic screening method for obtaining high expression of cellulase secretions when the bottom end has a fiber content of less than 5%, feeding 3-5 generations of the fly to obtain a stable high expression cellulase fly strains, placing the high expression cellulase fly strains in a bed for circulating for 10-15 generations to obtain fly maggot industrial product, drying the fly maggot industrial product into biological organic fertilizer, and biotechnologically treating the fly maggot industrial product to obtain a biologic medical material or product, where the housefly larva is made of animal health feed.