The invention relates to a synbiotics of bacillus licheniformis and oligosaccharide class prebiotics and a composite and a formulation thereof, being characterized in that the synbiotics comprises bacillus licheniformis medical live bacterial powder and the oligosaccharide class prebiotics, wherein the bacillus licheniformis medical live bacterial powder contains live bacteria about 30 billion/gram; the weight ratio of the bacillus licheniformis medical live bacterial powder to the oligosaccharide class prebiotics is 1:1 to 76; the weight ratio of the medical live bacterial powder of the composite, the oligosaccharide class prebiotics and auxiliary materials is as follows: 1.25-5 percent of the bacillus licheniformis medical live bacterial powder, 5-95 percent of the oligosaccharide class prebiotics, 20-50 percent of preferable oligosaccharide class prebiotics, 30-65 percent of diluting agents, 1-20 percent of bonding agents, 1-15 percent of disintegrating agents, 0.1-3 percent of lubricating agents, 1-10 percent of coating agents, 0.01-0.1 percent of flavoring agents, 0.0001-0.001 percent of coloring agents, and 0.1-15 percent of suspending agents. The synbiotics composite is prepared into oral common tablets, oral cavity disintegration tablets, dispersing tablets, enteric-coated tablets, granular formulation, enteric-coated granular formulation, capsules, enteric-coated capsules, dry supensoid agents and external tablets according to a conventional process; and an in vitro test shows that each formulation can promote the growth and the reproduction of the synbiotics of bacillus licheniformis, restrain the growth of harmful bacteria, enhance the immunizing power of parasitifers, reduce diarrhea and enhance the health care.