The invention belongs to the technical field of agricultural microorganism utilization, and particularly relates to a method for utilizing larvae-treated gibberellin fermentation residues to produce insect protein and organic fertilizers. The method includes: firstly, blending the gibberellin fermentation residues and plant fibrous materials 10-60% by weight and utilizing saccharomycetes to perform anaerobic digestion to obtain larva substrates; secondly, inoculating flyblows in the larva substrates for cultivation, controlling the temperature from 20 DEG C to 35 DEG C during the period of cultivation and cultivation time from 3 to 6 days, and separating to obtain live larvae and the treated fermentation residues, wherein the live larvae can be directly used for feeding fowls or being taken as insect protein after dried, and the gibberellin fermentation residues after treated can be used as biological organic fertilizers. By the method, harmful substances like pesticide residues in the fermentation residues can be effectively removed, and the mixture after treated is free of odor and can be used as the high-quality organic fertilizers; larvae powder contains 50-60% of crude protein and is applicable to feed additives of the fowls or fishes, and efficiency of resource utilization can be improved.