The invention discloses a composite probiotic nutritional supplement for pets. The composite probiotic nutritional supplement for pets comprises, by mass, 20-30% of a probiotic powder composition, 10-20% of maltodextrin, 10-20% of spirulina powder, 5-10% of glucose, 2-5% of Euglenophyta powder, 2-5% of inulin, 2-5% of stachyose, 0.5-1% of fructo-oligosaccharide, 0.2-0.5% of L-glutamine, 0.2-0.5% of taurine, and the balance of chicken liver powder (or fish meal). The composite probiotic nutritional supplement for pets can alleviate the gastrointestinal discomfort, gastric dyspepsia, loss of appetite, fecal odor caused by gastrointestinal dysfunction, and can also be used to help the recovery of gastrointestinal functions, improve the anti-stress ability of young pets suffering weaning, vaccination, travel and environmental change, provides essential nutrients for intestinal mucosal cell metabolism, maintain the intestinal mucosal epithelial structural integrity and enhance the immunityof pet bodies during postoperative recovery and after antibiotic treatment.