The present invention relates to a control system of smart water closet suitable for the older with an internet of things function. The system comprises a single-chip microcomputer (MCU), an input button, a sensor, an execution mechanism, a WiFi internet of things module and a power supply; the input button inputs the inputting button signals to the MCU through a data bus, the sensor inputs the signals to the MCU through the data bus, and execution mechanism receives the signals inputted by the MCU through the data; the MCU receives the signals from the input button and the sensor and then controls the execution mechanism, and the execution mechanism receives the input signals of the MCU and then starts the water closet; and the Wifi internet of things module receives or sends signals to the MCU through the data bus. The control system of smart water closet suitable for the older with an internet of things function is suitable for the order and has alarm and communication functions so as to facilitate using and contact with family in an emergency condition.