The invention relates to a biological insecticide liquid. The biological insecticide liquid is prepared by a method comprising the following steps: taking 10% by weight of cooled chili juice, 10% by weight of Sichuan pepper juice, 10% by weight of remusatia vivipara juice, 10% by weight of bittern, 12% by weight of
paliurus ramosissimus juice, 12% by weight of buddleia juice, 33% by weight of pineleaf juice, 2% by weight of pure rice vinegar and 1% by weight of trace elements, mixing, mechanically stirring until uniformity, detecting the concentration of the obtained mixed liquid
medicine tobe 18-20%, and canning. By reasonably controlling the concentration of each
medicine juice and adopting a specific amount of
medicine juice mixing proportion, the prepared liquid medicine has sour, bitter, spicy and hot, and
throat shock taste, and enters shells and internal organs of pests through air propagation to cause nerve and
respiratory system dyspnea and ultimate shock lethal, and the insecticidal rate reaches 100% within 20 hours. According to the main types of pests, the concentration of the
raw material medicine juice and the concentration of the mixed medicine liquid are controlled in a standardized mode, so the pest killing and killing effects are guaranteed, medicine waste is avoided, the manufacturing method is simple, and the purposes of pest killing and
plant protection are both achieved.