The invention relates to a comprehensive detection system and a comprehensive detection method of burning gas, heating water and heating. The comprehensive detection system of burning gas, heating water and heating comprises a temperature sensing collecting device, a pressure sensing collecting device, a flow sensing collecting device, a signal collecting controller, a signal collecting card, a display screen, and an industrial personal computer, wherein output ends of the temperature sensing collecting device, the pressure sensing collecting device and the flow sensing collecting device are connected with an input end of the signal collecting controller, the signal collecting controller is connected with the signal collecting card which is inserted in an industry standard architecture (ISA) slot on the industrial personal computer through a parallel port, a comprehensive detection software of the industrial personal computer reads data of the signal collecting card and processes, and results are displayed on the display screen. The comprehensive detection system and the comprehensive detection method of burning gas, heating water and heating can automatically and roundly detect the safety performance and the parameters such as temperatures, pressures and the flows of devices relating to burning gas, heating water and heating in the operational process.