Special micro-ecological preparation for laying hens and preparation method of special micro-ecological preparation

The invention relates to the technical field of feed additives, in particular to a special micro-ecological preparation for laying hens and a preparation method of the special micro-ecological preparation. The special micro-ecological preparation for the laying hens comprises the following raw materials: bacillus natto powder, aspergillus niger powder, calcium tartrate and chitosan oligosaccharide, wherein the bacillus natto powder and the aspergillus niger powder are prepared by adopting a solid fermentation method, the calcium tartrate is prepared by decalcifying shrimp and crab shells, andthe chitosan oligosaccharide is prepared by taking the decalcified shrimp and crab shells as a raw material to prepare a fermentation culture medium, inoculating bacillus subtilis and paecilomyces cicadae, and carrying out fermentation degradation to obtain the special micro-ecological preparation. Laying hen feed added with the special micro-ecological preparation for the laying hens is used forfeeding the laying hens, s