Abstract: A cat litter box includes a base, a driver, and a drum assembly. The driver drives the drum assembly to rotate. The drum assembly includes a drum body and a partition assembly. The partition assembly includes a partition plate, a little guide plate, a litter sieve, and an emptying plate. The partition assembly divides an accommodating cavity into a first cavity and a second cavity. The first cavity is configured to accommodate a pet. A waste collecting compartment and a little collecting compartment are defined in the second cavity. The litter sieve is a litter inlet of the little collecting compartment. The little guide plate is movable relative to the partition plate to communicate the first cavity with the waste collecting compartment. The little guide plate is a door of an waste inlet of the waste collecting compartment. The emptying plate is configured to cover the litter sieve.