The invention relates to a flow matching gas circuit for a trace gas integrated detector and belongs to the technical field of gas sensors/detectors. The flow matching gas circuit comprises an enriching device, a micro chromatographic column, a gas sensor, two air pumps and a three-way valve, wherein a working state of each part is controlled by virtue of a circuit board; the enriching device, the three-way valve, the micro chromatographic column, the gas sensor and the air pump (2) are sequentially connected in series to form a main gas circuit, meanwhile, a branched gas circuit branched from the three-way valve is connected with the air pump (1), the air exhaust speed of the air pump (1) is higher than that of the air pump (2), and the diameter of the branched gas circuit is larger than that of the main gas circuit. According to the flow matching gas circuit, the main gas circuit and the branched gas circuit are designed according to different working requirements of the enriching device and the chromatographic column in the trace gas integrated detector on the gas flow and are switched by virtue of the three-way valve; the flow matching gas circuit has the characteristics of simple structure and easiness in realization.