The invention discloses a gas chromatograph for gas analysis in production field, comprising a sampling unit, a gas path control unit, a circuit control unit, a separation unit, a detection unit and a data processing unit. The gas chromatograph for gas analysis in production field is characterized in that the sampling unit is a sampling and automatic sample injection unit, and is composed of a fixed volume sampling tube, a flow meter and a ten-way valve with blowing function; the gas path control unit is composed of a solid filter, a stainless steel diaphragm pressure stabilization valve and a helium purifier, and provides high-purity carrier gas for the separation unit; the circuit control unit is composed of a temperature control circuit, a signal amplification circuit and a detector pulse high-voltage circuit; the separation unit is provided with three diaphragm valves with blowing function, wherein one is the ten-way valve with blowing function in the sampling unit, the other two are four-way valves with blowing function, and complete separation of constituents is completed through a three-valve and four-column switching flow; the detection unit is a pulse helium ionization detector; and the data processing unit is composed of an embedded industrial control computer and a data uploading module. The gas chromatograph for gas analysis in production field has the advantages of high detection sensitivity, good stability and strong operability.