Chitin organic fertilizer produced by using livestock excrement and shrimp and crab shells and preparation method thereof

The invention discloses chitin organic fertilizer produced by using livestock excrement and shrimp and crab shells and a preparation method thereof. The chitin organic fertilizer produced by using the livestock excrement and the shrimp and crab shells comprises, by weight percentage, the following raw materials of 65 to 84 % of the livestock excrement, 5 to 15 % of waste of the shrimp and crab shells, 10 to 20 % of straw and 0.5 to 1 % of microbial agent. The chitin organic fertilizer has the advantages that a strong induction effect in the respect of restraining tobacco bacterial wilt is achieved, the tobacco is promoted to generate system resistance under the environmental stress of soil-borne disease, the soil biological activity can be promoted to improve at the same time, the occurrence of the conditions of tobacco vascular bundle deformation and xylem blocking can be reduced to a certain extent, therefore the efficient prevention and control over the tobacco bacterial wilt are achieved, and the problems that the organic fertilizer is slow in taking effect, the effect is not obvious after the fertilizer is applied, and the fertilizer performance is not stable are solved. In addition, the invention further discloses the preparation method of the chitin organic fertilizer.