The invention provides a sensor circuit manufacturing method integrated with temperature and humidity gas sensing and a sensor. The method comprises the following steps of manufacturing a temperature sensor on a first silicon chip; manufacturing a gas sensitive resistor and a humidity sensitive capacitor on a second silicon chip; encapsulating the first silicon chip and the second silicon chip into a whole; electrically connecting the gas sensitive resistor, the humidity sensitive capacitor and the temperature sensor. Two chips including one temperature sensing integrating semiconductor diode and analog digital integrated circuit and one humidity integrating and gas sensing unit sensor are respectively manufactured on the standard silicon chips by using a semiconductor process technology; through an encapsulation technology, the two chips are encapsulated into one encapsulation box to realize the single device; information such as temperature, humidity and gas type and concentration can be detected at the same time; the gas measurement signal is relevant to environment temperature and humidity; the integrated temperature and humidity data is used for correcting the gas measurement data; the gas measurement precision is improved.