Cat litter screening device and cat litter basin

The utility model discloses a cat litter screening device and a cat litter basin. The cat litter screening device comprises a rotating body, a litter guide plate and a screening net, the rotating body is provided with a containing space and a sewage draining exit communicated with the containing space, the litter guide plate and the screening net are connected with each other and jointly divide the containing space into a litter storage cavity and a litter screening cavity, the sewage draining exit is formed in the litter screening cavity, and the screening net is of a mesh structure. Wherein the sand guide plate is detachably connected with the rotating body, the side, away from the screening net, of the sand guide plate is arranged close to the drain outlet, and a stopping part is arranged on the inner wall of the containing space and abuts against the side, away from the screening net, of the sand guide plate so as to generate stopping force on the sand guide plate. The blocking force is used for preventin