The invention relates to a method for treating sewage in a refined oil store, and is mainly used foe solving the problem that the sewage in the refined oil store is difficult to treat in the prior art. The problem is well solved through the technical scheme that the method for treating the sewage in the refined oil store comprises the steps that the sewage in the refined oil store is sequentially treated in a pre-filtration separator, a primary coalescing separator, a secondary coalescing separator and an electric adsorption reactor, then the effluent contains less than or equal to 1.0mg/L of petroleum, and the COD of the effluent is less than or equal to 50mg/L, wherein a filter element is arranged in the pre-filtration separator, a high-density structured packing is filled in the primary coalescing separator, a coalescing filter element is arranged in the secondary coalescing separator, and active carbon granules and inert particles are filled between the negative and positive electrodes of the electric adsorption reactor. The method can be applied to treatment of oily sewage.