The utility model discloses a soil gas sampling device for oil pollution detection of aeration zone soil, which belongs to the technical field of oil pollution detection. The device is formed by sequentially connecting a soil gas sampling device, a flow control system and a sample collection system; the flow control system comprises a sucking pump and a gas flowmeter; the sample collection system comprises a gas collection bag and an absorption rod; the soil gas sampling device is a low-carbon steel suction pipe, the head of the soil gas sampling device is conical, and two sides of the upper side of the head of the soil gas sampling device are provided with two rows of gas inlets; and a tail gas outlet is in sealed connection with a silica gel hose. By the method, whether underground oil pollution exists at a gas station can be judged qualitatively, and the pollution range can be judged qualitatively, and the position of a pollution source can judged primarily; and by multiphase equilibrium concentration analysis, the pollution degree can be judged qualitatively, and the micro-biological degradation capacity of soil can be calculated qualitatively according to the change of O2 and CO2 content.