The invention relates to a pet food, in particular to a cat food capable of preventing diseases in the urological system. The cat food is prepared from the following components in percentage by mass: 1-3% of a carrot extract, 3-5% of a cranberry extract, 0.1-0.5% of herba lysimachiae powder, 2-5% of dewatered lamb liver powder, 0.1-0.4% of taurine, 6-10% of egg white powder, 1-3% of fish bone meal, 1-3% of threonine, 0.5-1.5% of lysine, 10-50% of chicken, 1-6% of potassium sorbate, 1-3% of deep sea fish oil, 0.5-1.5% of animal oil, 0.5-1.5% of dicalcium phosphate, 3-6% of fish meat, 0.5-0.8% of fungus powder, 1-2% of COM-IFN factor prime factors, 1-5% of vitamin C, 1-5% of a food additive, and the balance being buckwheat powder. The cat food is rich in vitamin A, contributes to blocking the growth of calculus, has the efficacies of clearing heat, removing toxicity, promoting urination and expelling stones, can enable urine to be changed into acidic, can enable calculus existing in the alkaline condition to be dissolved, and can effectively prevent urinary tract infection of pets.