The invention relates to an insecticide composite for killing potato beetles and a preparation method thereof, belonging to the technical field of insecticides. The insecticide composite comprises the following components in parts by weight: 8 to 12 parts of cyfluthrin, 0.5 to 1 part of chlorempenthrin, 0.2 to 4 parts of nicotine, 0.3 to 0.6 part of turpentine oil, 0.3 to 0.7 part of methoxyfenozide, 0.5 to 1 part of thiamethoxam amide, 0.2 to 3 parts of butene-fipronil, 0.7 to 1 part of acetamiprid, 0.2 to 0.4 part of deltamethrin, 0.2 to 0.4 part of thiamethoxam, 0.2 to 0.4 part of amino thiazoline, 0.3 to 0.5 part of oxidized piperonyl butoxide, 40 to 45 parts of butyl acetate, 4 to 8 parts of dimethylformamide, 1 to 3 parts of tributyl phosphate, 0.5 to 0.7 part of tristyrylphenol ethoxylates, 0.7 to 0.9 part of nonylphenoxypoly(ethyleneoxy)ethanol, 0.8 to 1.2 parts of sodium dodecyl benzene sulfonate and 100 to 150 parts of water.