Disclosed is a cat litter, including the following raw material compositions in weight parts: 40-60 parts of bamboo extract, 10-20 parts of soybean residue powder, 5-10 parts of sweet potato residue powder, 4-8 parts of pine sawdust, 30-50 parts of bentonite, 5-8 parts of diatomaceous earth, 5-8 parts of volcanic rock particles, 4-6 parts of perlite powder, 0.5-1.5 parts of anthocyanins, and 4-6 parts of binder. The present disclosure also discloses a method for preparing cat litter, including the following steps: S1. Preparation of raw materials; S2. Preliminary mixing of raw materials; S3. Grinding; S4. Solution preparation; S5. Secondary mixing; S6. Granulation; S7. Drying. The present disclosure adds bamboo extract to make the raw materials green and healthy, increasing safety of use. When discarded, it can be directly buried in the ground as a soil nutrient, which is environmentally friendly, biodegradable, safe and pollution-free.