The utility model discloses a water-oil separation device, and relates to the technical field of sewage treatment. The water-oil separation device comprises a water tank used for containing filtered water and a filtering device erected above the water tank, an opening is formed in the upper end of the filtering device, a first filtering net is arranged at the lower end of the filtering device, sand is arranged on the upper surface of the first filtering net, and the hole diameter of the first filtering net is smaller than the particle diameter of the sand. By means of the arrangement, the water-oil separation device is simple in structure, capable of continuously separating oil-containing wastewater, capable of achieving continuous operation and high in oil removal efficiency on the oil-containing wastewater, and the problems that in the prior art, water-oil separation equipment is high in manufacturing cost, high in energy consumption and low in oil removal efficiency are solved.