The utility model provides an error calibrating device of transformer oil gas analysis, includes first spectrum appearance, second spectrum appearance and impurity filtering device, impurity filtering device includes the support, and two volumetric apparatus of shelf location and filter, two volumetric apparatus install respectively in the upper portion and the lower part of filter, and volumetric apparatus and filter are established ties, set up second communicating pipe between impurity filtering device and the first spectrum appearance, the second is equipped with the delivery pump on communicating pipe, first spectrum appearance, second spectrum appearance are all installed on the rotor plate, and rotor plate bottom sets up the roating seat, and roating seat drive rotor plate rotates, sets up the mount on the roating seat, sets up electric push rod on the mount, the piston rod of electric push rod down, the tip of electric push rod sets up the checkpost, checkpost connecting plug, the plug can with first spectrum appearance or the cooperation of second spectrum appearance. The utility model discloses a two spectrum appearance detect respectively, realize the error calibration.