The invention discloses an ethylene glycol refining and separating method and system, solving the problems of complex process, difficult separation and high equipment investment and energy consumption existing in the prior art. Reaction mixed gas from an ethylene glycol synthetic system is cooled and then is separated by a first gas-liquid separator, the gas phase is fed into the ethylene glycol synthetic system as hydrogen-containing circulating gas, and the liquid phase is fed into a methanol recovering tower to product methanol from the top of the tower; the reaction mixed gas is fed into the second gas-liquid separator after cooling, the gas phase is cooled further and then is fed into the first gas-liquid separator, the liquid phase is mixed with a tower bottom liquid from the methanol recovering tower and then is fed into a degreasing tower, mixed ethanol ester is produced from the top of the degreasing tower, the tower bottom liquid is fed into a hydrogen removing tower, light alcohol is produced from the top of the hydrogen removing tower, the tower bottom liquid is fed into a refining tower, and qualified ethylene glycol is produced from the top of the refining tower, a side-draw is arranged at the same time to extract high-quality ethylene glycol. The process is simple, the operation is simple and convenient, the equipment investment and running cost are low, the impurity separation effect is favorable, and the yield is high.