The invention discloses a shaft-free octagonal roll cage device for removing oil, receiving oil and screening chips. The shaft-free octagonal roll cage device for removing oil, receiving oil and screening chips comprises an oil removing mechanism and an oil contamination collecting mechanism arranged at one side of the oil removing mechanism; the oil removing mechanism comprises a water tank of which the top is arranged in an open manner; a supporting framework is arranged in the water tank; a roll cage combined body which is obliquely and downward arranged is arranged at the top of the supporting framework; a circulating water flushing mechanism is arranged at the inner side of the roll cage combined body; a roll cage driving mechanism for driving the roll cage combined body to rotate is arranged at one side of the top of the water tank. By using the shaft-free octagonal roll cage device for removing oil, receiving oil and screening the chips, materials entering the roll cage are enabled to generate rollover and rubbing; under the impact of high-pressure water, after dirt and grease are separated from the materials, the dirt and the grease are separated from sewage by a dirt separating mechanism and a grease collecting mechanism, the sewage is purified and then is recycled, and the aim of cleaning the materials is achieved under the conditions of water saving and environmental protection.