To provide a cat litter box including a slope passage with projections for removing cat litter box stuck to the paw pads of a cat and preventing the cat from scattering the litter around the cat litter box after evacuation, and integrated with the slope passage for facilitating the cleaning.

The pet litter includes the slope passage 1 and a side wall 2 integrated with a cat litter box body 3, is configured to make the cat surely pass the slope passage 1 when coming in and out the litter. When the cat goes outside the litter after the evacuation, paw pads are deformed by climbing up the slope passage 1 to remove the cat litter box stuck between the pads, and the removed cat litter box spontaneously falls on a litter floor along the slope face.