The invention relates to a microbial insecticide, which is a concentrated cenobium composed of 18 microbial strains classified into three types. Characterized by strong insecticidal ability, fast insecticidal speed and wide insecticidal range, the microbial strains respectively are: Metarhizium anisopliae, Paecilomyces farinosus, Phytophthora nicotianae, Streptomyces amilatus, Streptomyces culicidicus, Streptomyces griseolus subsp.hangzhouensis, Streptomyces calvus, Bacillus subtilis, Bacillus sphaericus, Bacillus laterosporus, Bacillus thuringiensis subsp.aisawai, Bacillus thuringiensis subsp.merrisoni, Bacillus thuringiensis subsp.galleriae, Bacillus thuringiensis subsp.Israelensis, Bacillus thuringiensis subsp.thuringiensis, Bacillus thuringiensis subsp.berliner, Bacillus thuringiensis subsp.dendrolimus, and Bacillus thuringiensis subsp.sotto.