The present invention relates to a device of automatically treating excretion of a cat. The device of automatically treating excretion of a cat comprises: a case including an upper case with an excretion collecting groove configured to collect excretion of a cat and formed on one side, an opening, through which the cat enters and exits, formed on a front side as the upper case is combined with a lower case, and a cover detachably attached to the upper case to block odors of the excretion contained in the excretion collecting groove； a sand drum installed between the upper case and the lower case and having a sand filter configured to separate the excretion of a cat from sand and formed therein to be inclined at a predetermined angle and a drum gear rotated by a driving force of a motor； a driving unit installed on one inner side of the lower case by a motor bracket and including the motor configured to rotate the sand drum by the driving force； a control board formed on an inner side of the case and configured to enable a user to control driving of the motor according to a setting reference by a signal which detects entrance or exist of the cat via an optical sensor installed on the opening of the casing so as to separate the excretion from the sand； and an operation unit installed on an outer side of the case and configured to control a rotation speed of the sand drum rotated by the driving force of the motor, such that excrement and urine by the cat can be automatically treated, and bad odors as well as noise are prevented from generating due to quick treatment, and thus, it is possible to provide a clean and comfort environment to the cat.COPYRIGHT KIPO 2019본 발명은 고양이 배변 처리장치에 관한 것으로, 일측에 고양이 배변이 담기는 배변수거홈이 형성되는 어퍼케이스가 구성되어 로우케이스와 결합하여 전면에 고양이가 입출하는 입구가 형성되고 배변수거홈에 담긴 배변의 냄새를 차단할 수 있도록 덮개가 어퍼케이스에 착탈 가능하게 설치되는 구성을 포함하는 케이스와； 고양이의 배설물과 모래를 분리하는 샌드필터가 소정 각도로 경사지게 내부에 설치되어 모터의 구동력에 의해 회전할 수 있도록 드럼기어를 가지며 어퍼케이스와 로우케이스 사이에 설치되는 샌드드럼과； 모터브라켓에 의해 로우케이스의 내부 일측에 설치되어 구동력에 의
