The invention discloses a method for preparing complete feed through probiotics asynchronous high-low-moisture fermentation and belongs to the technical field of microbial feed. The method comprises the following concrete steps that: firstly, protein feed is subjected to impurity removal and crushing, nutrition substances are added, mixed and stirred with clean water, and the moisture content is regulated to 60 to 70 percent; then, yeast, bacillus licheniformis and bacillus subtilis strain liquid is inoculated, high-moisture-content aerobic fermentation is carried out for 12 to 96 hours, and the fermentation temperature is 35 to 45 DEG C; then, energy feed is added, mixing and stirring are carried out, and the moisture content is regulated to 25 to 35 percent; next, lactobacillus lactis, enterococcus faecium, lactobacillus acidophilus, enterococcus faecalis and lactobacillus plantarum strain liquid is added, complex enzyme is added, the low-moisture-content anaerobic fermentation is carried out for 24 to 120 hours, and the fermentation temperature is 25 to 35 DEG C; and finally, the complete feed finished product is prepared through rolling tube drying, mixing and stirring, granulation and package. The method has the beneficial effect that the production efficiency and the feed nutrition value are improved.