The utility model discloses a transformer ONLINE CHROMATOGRAM appearance standard oil prepares device, the device's mark gas unit include a plurality of mark gas cylinder and first singlechip, join in marriage oily unit and include that the piston joins in marriage hydro -cylinder, degasification jar, circulating pump and second single -chip microcomputer, wherein, the piston is joined in marriage the hydro -cylinder and is included hydro -cylinder and cylinder, the hydro -cylinder that the mark gas cylinder is joined in marriage in the hydro -cylinder through intake pipe and piston is linked together, the hydro -cylinder that the piston is joined in marriage in the hydro -cylinder constitutes a circulation circuit with the circulating pump through first pipeline, the hydro -cylinder that the piston is joined in marriage in the hydro -cylinder is linked together through second pipeline and degasification jar, be equipped with the diffusion of gases head in the degasification jar, this diffusion of gases head is linked together through first breather pipe and nitrogen cylinder, degasification jar still is equipped with blank oil import, the piston join in marriage cylinder in the hydro -cylinder pass through the second breather pipe with the nitrogen cylinder is linked together. The utility model discloses an oil distribution device joins in marriage the oil accuracy, but and waste oil cyclic utilization.