Bio-organic fertilizer and preparation method thereof

The invention discloses a bio-organic fertilizer and a preparation method thereof, and belongs to the field of livestock and poultry manure utilization. Aiming at the problems of poor antibiotic degradation effect and high cost of the existing aerobic composting treatment, the invention provides the preparation method of the bio-organic fertilizer, and the preparation method comprises the following steps: inoculating a liquid culture medium with a citrobacter vinegaticus YB04 single colony, and culturing to obtain a seed culture solution; inoculating the seed culture solution into a fermentation culture medium for fermentation, and adding an inducer and an activator for culture; mixing livestock and poultry manure with straw or mixing livestock and poultry manure with bran to form a compost material, and then adding fermentation liquor into the compost material for normal-temperature fermentation; and drying and crushing the excrement fermentation product to obtain the bio-organic fertilizer. The tetracycline