The invention relates to an industrial oil water separation method and a system thereof. The method comprises the following steps that: (1) an oil water separation system consisting of a T-shaped pipe, shunts, volute pipes and gravity sedimentation separation box bodies is adopted and the composite principle of the centrifugation, gravity and bulge of oil and water is used to separate the oil from the water, (2) after oil water mixture is input into a horizontal total intake pipe, the entrance pressure of the first shunt is adjusted so that the oil water mixture enters the first shunt to be delaminated, (3) the oil water mixture enters the T-shaped pipe through a vertical pipe for further separation so that the mixture containing little oil phase liquid declines into a lower horizontal pipe, (4) the oil water mixture in an upper horizontal pipe enters the volute pipe of the first sedimentation separation box through the second shunt for centrifugal separation and the mixture distributed at the inner side of the volute pipe enters the second sedimentation box for gravity sedimentation separation, and (5) after the centrifugal separation of the oil water mixture in the lower horizontal pipe through the volute pipe in the third sedimentation separation box, the oil water mixture enters the fourth sedimentation separation box for separation.