The utility model relates to an air conditioning system, in particular to an air-conditioning room temperature and humidity control device. The device comprises a temperature and humidity composite sensor and a temperature sensor, wherein the temperature and humidity composite sensor and the temperature sensor are arranged in a controlled air-conditioning room, so that indoor real-time temperature and humidity information is obtained through the temperature and humidity sensor, then feedback and correction are carried out, and accordingly on the premise that related equipment is adjusted to save energy, the temperature and humidity range within which thermal comfort of a human body can be achieved is achieved. A single chip microcomputer receives temperature and humidity information measured through the temperature sensor and the temperature and humidity composite sensor, the obtained temperature and humidity information is compared with preset temperature and humidity data, the openness of a first valve, a second valve, a third valve, a fourth valve and a fifth valve is controlled through a valve controller, and accordingly temperature and humidity of the air-conditioning room are controlled. When the temperature and the humidity of the air-conditioning room are consistent with set values, the device stops working.