NOVELTY - A biomass three-phase separator device has a tank body provided with an outer cylinder, an inner cylinder and a return cylinder, where the inner cylinder is fixed at a lower part of a micro-aeration head. Two sides of top of the return cylinder are fixed with a foam removing oil tube and an oil discharging tube that is connected with an oil skimmer. An annular biomass filter is fixed on the outer cylinder. The micro-aeration head is connected with an air blower. A drain pipe is connected with an overflow groove. A discharging pipe is connected with the outer cylinder.    USE - Biomass three-phase separator device.    ADVANTAGE - The device has simple and compact structure, low manufacturing cost, low energy consumption and low investment. The device reduces use of chemical medicine so as to reduce processing cost, and improves treatment effect.    DETAILED DESCRIPTION - A biomass three-phase separator device has a tank body provided with an outer cylinder, an inner cylinder and a return cylinder, where the inner cylinder is connected to bottom of the outer cylinder. The return cylinder is fixed in the outer cylinder and the inner cylinder. The inner cylinder is fixed at a lower part of a micro-aeration head. A water inlet pipe is connected with a lower part of the inner cylinder. A triangular fluid director is placed above a biomass core device of an internal reflux cylinder. Two sides of top of the return cylinder are fixed with a foam removing oil tube and an oil discharging tube that is connected with an oil skimmer. An annular biomass filter is fixed on the outer cylinder. An annular biomass filter part is provided with an annular micro-aeration device. The micro-aeration head is connected with an air blower, where the outer cylinder is provided with an overflow groove. A drain pipe is connected with the overflow groove. A discharging pipe is connected with the outer cylinder.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a biomass three-phase separator device.