The utility model relates to a power engineering technology field, concretely relates to it prepares device to be favorable to mixing quick absorptive standard oil appearance of mark gas, including the hydro -cylinder, be equipped with the piston in the hydro -cylinder, the oil feed passageway has been seted up at the piston middle part, oil feed passageway and hydro -cylinder intercommunication,the oil feed passageway of hydro -cylinder top and piston is connected with circulation pipeline's both ends respectively, last mark gas air inlet, gear pump and the air -fuel mixture ware of having connected gradually of circulation pipeline, the air -fuel mixture ware includes the staving, and staving and circulation pipeline intercommunication are equipped with impeller and multistage baffle inthe staving, and the baffle setting is in the impeller lower part, and the impeller center pin is fixed on the staving inner wall, is equipped with a plurality of rotating vane on the impeller centerpin, the baffle slope sets up, and baffle one end and the interior wall connection of staving are equipped with oil channel between the other end and the staving inner wall. The utility model discloses can standard oil's preparation quality have been improved with marking gas and fluid intensive mixing.