Phycomycete complex fermented feed additive and preparation method thereof

The invention discloses a phycomycete complex fermented feed additive and a preparation method thereof. The additive is prepared from the following components in parts by weight: 10-40 parts of alga slurry, 5-8 parts of honey, 5-8 parts of residue of soya, 25-35 parts of yeast paste, 15-30 parts of bean pulp, 10-30 parts of complex microbial suspension, 0.01-0.12 part of cellulase and 95-182 parts of water. The preparation method comprises the step of preparing the components by a semi-solid three-stage mixing and fermenting technology. The feed additive product produced by a scientific complex formulation and microbial mixing and fermenting technology is rich in high-quality single-cell protein, active probiotics and multiple hydrolase activities, and can be used for promoting growth of livestock and poultry, effectively improving intestine health of animals, effectively improving animal immunity, reducing usage of antibiotics and improving the conversion rate of feed.