a main body, having a first accommodating space facing upwards and defining a discharge port and a first inlet that are each in communication with the first accommodating space; wherein the discharge port is disposed below the first accommodating space, and the first inlet is disposed on a side wall of the main body;

a separation body, of an open bowl-shaped structure; wherein the separation body is rotatably and detachably arranged on the main body; the separation body is disposed and rotatable in the first accommodating space; the separation body has a second accommodating space and defines a second inlet that is in communication with a first inlet; the first inlet and the second inlet are in a same direction to form a toilet entrance;

an inner liner; wherein a shape of the inner liner is the same as a shape of the separation body; the inner liner is detachably arranged on the separation body, and an outer surface of the inner liner completely covers an inner surface of the second accommodating space; and

a screen assembly; wherein a lower part of the screen assembly is arranged in the second accommodating space, dividing the second accommodating space into a first litter bin and a second litter bin; an upper part of the screen assembly extends perpendicular to the lower part of the screen assembly, and the upper part of the screen assembly is detachably arranged on the separation body; an upper part of the first litter bin is closed, and the toilet entrance is in communication with the second litter bin.