Intelligent collecting and testing system and method for harmful gas

The invention provides an intelligent harmful gas collection and test system and method. The test system comprises a sensor assembly and an industrial control and remote transmission assembly. The sensor assembly comprises a mass flow meter, a pressure transmitter and a combustible gas detector. The industrial control and remote transmission assembly comprises a PLC industrial control system and a display screen. When the test system is in an air tightness test, the pressure transmitter detects a pressure reading at an interval of a preset time threshold value; when the test system is in a well washing test, the combustible gas detector detects the concentration of combustible gas; when the test system is in a gas sample collection mode, the mass flow meter collects gas flow; when the change of the pressure reading is smaller than a preset pressure threshold value, the air tightness of the test system meets the technical requirement; when the combustible gas concentration exceeds a preset gas threshold value,