Chicken manure, pig manure and pleurotus eryngii mushroom bran-containing organic fertilizer and preparation method thereof

The invention discloses a chicken manure, pig manure and pleurotus eryngii mushroom bran-containing organic fertilizer and a preparation method thereof. The preparation method comprises the following steps: crushing chicken manure, pig manure and pleurotus eryngii mushroom brans by using a crusher, sieving the obtained objects, uniformly stirring 25-35% of chicken manure, 28-32% of packing-free pig manure and 33-47% of pleurotus eryngii mushroom brans (weight ratio) so as to obtain a mixture; adding bentonite into the mixture, wherein the weight of the bentonite accounts for 0.1-0.5% of the weight of the mixture; controlling the C/N ratio to be (25-35):1, and vaccinating 0.1-5% of a microbial starter; piling a stack with the length of 2.0-35m, the width of 0.25-3m and the height of 0.08-1.1m by using a fork-lift truck according to the amount of materials; and controlling the initial moisture content to be about 55-60%. Regular stack overturning is implemented every day by using a stack overturning machine, and ventilation and oxygen supply is implemented, so that thoroughly decomposed materials can be obtained after 15-18 days of a fermented manure period. The thoroughly decomposed materials can be prepared into different fertilizers such as bio-organic fertilizers and biological organic and inorganic fertilizers and the like as required. The raw materials are combined for fermentation, the fermentation period is short, the loss of nitrogen is few, and the pollution degree of odor to the environment is low.