The present invention relates to a modular cleaning apparatus for a pet potty, and more particularly, to a modular cleaning apparatus for a pet potty capable of blocking water from overflowing or unnecessarily flowing. A modular cleaning apparatus for a pet potty according to the present invention comprises: a pet potty including a net accommodating a pet thereon for evacuation, an excrement receiver receiving pet excrements flowing from the net and discharging the same through a discharge hole and having nozzles provided to both ends of a side opposite to the discharge hole, a water inlet pipe allowing water supplied from a sub module into the nozzles, a drain pipe draining waste water flowed in through the discharge hole after cleaning the excrement receiver, and a transmitter sensor unit installed with a transmitter sensor transmitting a signal to a receiver sensor； a water tank combined to one side of a structure having a main module and the sub module stacked therein, and having a water storage space and an opening/closing unit opened/closed to supply the water； the sub module having an underwater pump spraying the water flowed in a tank from the water tank through a supply pipe to the pet potty through the water inlet pipe； the main module provided to a lower portion of the sub module by being detachably combined thereto, and having a drainage compartment receiving the waste water through the drain pipe and including a filter to filtrate foreign materials of the waste water, the receiver sensor receiving the signal of the transmitter sensor, and a drainage pump pumping up the waste water to the drainage compartment by a pumping action； and a controller grasping whether or not a pet evacuates through a detection signal by a sensing activity of the transmitter sensor and the receiver sensor, thereby controlling an operation of the underwater pump.본 발명에 따른 모듈식 애완동물용 배변기 청소장치는, 애완동물이 배변을 위해 안착되는 네트 및, 상기 네트로부터 유입된 애완동물의 배변을 수용하여 배출공으로 배출하되 상기 배출공의 대향 측 양단에 구비된 분사구
