An air foam flooding produced gas on-line inspection apparatus and process, and belongs to the technical field of oil extraction. An explosion-proof power supply 1 is connected to and provides power for a flow controller 4, a solenoid control valve 5, an O2, CO, CO2 and combustible gas detection transmitter 10, a GPRS network device 12 and all pipe insulation heating devices. A wellhead casing head gas is introduced into a flow controller 4 through a gas introduction pipe; the other end of the flow controller 4 is connected to the solenoid control valve 5 via line; the other end of the solenoid control valve 5 is connected a buffer tank 6 via line; the bottom of the buffer tank 6 is connected to an electromagnetic valve 8; a pipe on the upper part of the buffer tank 6 is connected to a gas filter 9; the other end of the gas filter 9 is connected to the O2, CO, CO2 and combustible gas detection transmitter 10 via a pipe; the O2, CO, CO2 and combustible gas detection transmitter 10 is connected to a data acquisition unit 11; the data acquisition unit 11 collects and transmits the test data to the GPRS network device 12 and transmits the data to the a computer software apparatus 7 in a control room.