Compound missible oil for preventing and treating cabbage plutella xylostella

The invention relates to compound missible oil for preventing and treating cabbage plutella xylostella. Effective ingredients are chitosan oligosaccharide and azadirachtin. The compound missible oil has good preventing and treating effects on cabbage plutella xylostella. Since the effect of promoting plant growth of chitosan oligosaccharide and the insecticidal activity of azadirachtin have the synergism effect, the effect of preventing and treating the cabbage plutella xylostella is effectively enhanced, the obvious preventing and treating effect can be achieved in earlier stage or later period of pathogenesis, and the pharmacy suitable period is long.