The invention relates to a biopesticide capable of reducing cucumber insect diseases. The biopesticide capable of reducing cucumber insect diseases comprises, by weight, 20-30 parts of potassium silicate, 20-30 parts of expanded perlite, 20-30 parts of quicklime, 10-15 parts of fish maw glue powder, 5-10 parts of N-propyl phosphoric triamide, 5-10 parts of monopotassium phosphate, 1-2 parts of zinc sulfate, 1-2 parts of soybean meal, 2-4 parts of rapeseed oil residue, 0.5-1 part of lutein ester, 0.2-0.5 part of zymocyte, 1-3 parts of high fructose corn syrup, 1-2 parts of a water retaining agent, 1-2 parts of sodium ortho-nitrophenolate, 0.4-0.6 parts of a pesticide, and 0.5-1 part of a plant growth regulator. The active ingredients of the biopesticide are capable of supplementing each other and cooperating synergistically, obvious control effects on aphids, beetles and other soft pests are achieved, sterilization and insect killing effects are excellent, drug resistance is not caused,and no residue is left on cucumbers.