An automatic flushing device for a cat according to the present invention includes: a sensing control unit responsible for a sensing function for checking the presence or absence of a cat on a toilet stool, a sensing distance function for deciding on distances at which the cat is regarded as being present, a delay time function for instructing a flushing operation to be performed after the elapse of a predetermined period of time, and a function for controlling the flushing operation and the like a flushing operation unit connected to the sensing control unit in a wired or wireless manner, positioned in a water storage tank of the toilet stool, and responsible for the flushing operation and a snack switch portion connected to the sensing control unit in a wired or wireless manner and configured to be capable of operating a flushing switch while the cat eats a snack. With the automatic flushing device for a cat according to the present invention, flushing is automatically performed after defecation and urination or the cat is driven to touch the flushing switch by means of the snack after defecation and urination even without a person having to perform flushing after the hassle of checking, and then the flushing operation unit can be put into operation. Accordingly, the person does not have to experience the hassle of keeping following the cat and pressing a flushing lever after checking the completion of defecation or urination. Since the toilet stool can be used in the state of defecation or urination completion at all times even without the person taking care of it over a long period of time, problems can be dealt with such as the necessity of having to leave the cat to someone else for defecation or urination handling in a case where he or she has to leave home for long.COPYRIGHT KIPO 2017본 발명에 의한 고양이를 위한 자동물내림장치는, 양변기 위에 고양이가 있는지 없는지를 확인하는 감지기능, 어느 거리 내에 있어야 고양이가 있는 것으로 간주하는지 결정하는 감지거리기능, 일정한 시간이 지나야 물내림동작을 지시하는 지연시간기능 및 물내림동작 등을 제어하는 기능을 담당하는 감지제어부 유선 또는 무선으로 감