The invention discloses a special pesticide for sugarcanes. The special pesticide for the sugarcanes is prepared from the following components in parts by weight: 20 to 30 parts of tobacco, 15 to 25 parts of pyrethrum, 10 to 18 parts of alum, 10 to 16 parts of sulphur, 8 to 10 parts of stone-like omphalia, 8 to 10 parts of pepper, 4 to 6 parts of fructus cnidii, 4 to 6 parts of unprocessed rhizoma pinelliae, and 1 to 3 parts of fructus kochiae. The invention also provides a preparation method of the special pesticide for the sugarcanes. The invention has the beneficial effects that according to the special pesticide for the sugarcanes and the preparation method thereof provided by the invention, injurious insects can be killed effectively, not only is the harm to cultures less, but also the growth rate of the cultures can also be increased, and the market prospect is favorable.