Abstract: A self-cleaning animal litter box comprised of an open imperforate container, a superimposed separator on said container and having upstanding wall structure surrounding a centrally disposed screen and abutting the walls of that container in sealing relation, and a second but inverted container having depending wall structure which corresponds in shape but is slightly larger in transverse dimensions than that of the separator and which is superimposed with respect to the separator and first container in sealing relation to form a unit whereby inversion of the unit causes the screen to automatically separate the litter from the animal excrement which may have been deposited thereon.