The invention discloses an Isaria fumosorosea water dispersible granule. The water dispersible granule is prepared from Isaria fumosorosea spore powder, sodium lignosulfonate (CMN), sodium dinaphthylmethanedisulfonate (NNO), isooctyl alcohol polyoxyethylene ether polyoxypropylene ether (CA-60), sodium alpha-olefin sulfonate, corn starch, fumed silica, ammonium sulfate, polyvinylpyrrolidone K30, pre-gelatinized starch, a combination of fumed silica and acid yellow 25 or chrysophenine 12, skim milk powder or chitosan oligosaccharide, water-absorbent resin SAP and diatomaceous earth. Low-cost andhigh-stress resistance fermentation, drying and coarse spore powder preparation processes are adopted; a surfactant with best biocompatibility, wettability, dispersibility, disintegration property and adhesion property is screened; and the invasion and germination ability of the above preparation in low-humidity fields is improved. The production cost is reduced, the performances of the preparation are effectively improved, the shelf life is especially prolonged, and the field drug effect is especially improved.