Method and device for detecting total organic content of gas

The invention discloses application of a photocatalysis phase transfer device and a photoelectrocatalysis COD determinator together to measure total organic content in a gas, comprising a photocatalysis phase transfer device, a work electrode and a liquid phase sampling pipeline, wherein a gas circulation system, a photocatalysis phase transfer system and a liquid-phase photocatalysis absorption-degradation system are arranged in a shell of the photocatalysis phase transfer device in turn; the gas circulation system also comprises a circulation gas inlet formed at one end of the shell and a gas circulation pipeline; one end of the gas circulation pipe is connected with the circulation gas inlet, while the other end is connected with the liquid-phase photocatalysis absorption-degradation system; the work electrode is arranged in a shell; a photoelectrocatalysis reaction area is arranged on the surface of the work electrode; a sample inputting port and a sample outputting port are formed in the shell, a counter