The invention provides an oil storage barrel comprising an oil barrel and an oil barrel cover mounted on the oil barrel. The oil storage barrel is characterized in that two CPCs (Circular Plastic Connectors) are fixed on the oil barrel cover, wherein the lower end of one CPC is connected with a relatively longer internally connected oil pipe which is inserted in the oil body of the oil barrel and is close to the bottom of the oil barrel; and the lower end of the other CPC is connected with a relatively shorter internally connected oil pipe which is exposed on the oil surface. By adopting the CPCs in the invention, the oil barrel cover is prevented from being fully opened so as to reduce introduced oxygen, effectively prevent oil oxidation and achieve convenience in use, and liquid leakage is avoided after multiple uses, thus, the problem of oil oxidation and deterioration caused in processes of filling, transporting, sampling, storing, using, and the like by oil production enterprises is effectively solved, oxygen is prevented from being introduced into the oil barrel after the oil barrel cover is opened and oil sampling and oil detecting are convenient.