The utility model relates to a power engineering technology field, concretely relates to on -line chromatograph intelligence calibration test device, including oil distribution device, oil distribution device includes the oil pocket, oil drum and sample connection are connected respectively to the oil pocket, outside circulation pipeline is connected to the oil pocket, two upper and lower interfaces of oil pocket are connected respectively at the circulation pipeline both ends, circulation pipeline connects mark gas air inlet, it refines the device to be equipped with diffusion of gases between mark gas air inlet and the circulation pipeline, diffusion of gases refines the device and includes tubular main body, the main part both ends communicate mark gas air inlet and circulation pipelinerespectively, be equipped with the air -permeable sheet of a plurality of cylinders in the main part, air -permeable sheet parallel arrangement, the air -permeable sheet plane acutangulates or the right angle with the central line of main part, air -permeable sheet is last to be equipped with a plurality of ventilative through -holes. The utility model discloses simple structure for in the mode entering oil pocket of mark gas with tiny bubble, make things convenient for the oil to absorb fast, improved and joined in marriage oily effect.