The invention discloses a bacillus cereus and probiotics powder thereof as well as preparation and application of the probiotics powder. Bacillus cereus BC158 is separated, purified and screened from excrement of healthy piglets and has a collection number of CGMCC (China General Microbiological Culture Collection Center) No.7433. The bacillus cereus has high acid resistance, high cholate resistance, high adhesive force and high safety, has a certain inhibitory property to common pathogenic entero becteria and can produce amylase, protease and cellulase. According to preparation of the probiotics powder of the bacillus cereus, a step-to-step magnified four-stage culture process is adopted, high-density culture of the bacillus cereus BC158 is realized through a ventilated and mixed submerged liquid fermentation technology, and high-temperature protection effects of corn starch and other auxiliary materials are combined to realize high-density recovery of bacillus cereus in the fermentation liquor. The preparation method is simple and low in cost, the spore rate in the prepared probiotics powder is over 95 percent, the content of viable bacteria in the bacillus cereus is 3*10<9>-5*10<10>CFU / g, and the bacillus cereus can be applied to feed additives in animal breeding.