The invention discloses an oil separation device, relates to the field of compressors, and aims to provide the oil separation device which is high in gas-liquid separation efficiency and can meet requirements on variable working conditions of products. The oil separation device comprises a shell provided with a chamber body, wherein a gas inlet, a gas outlet and an oil return port are formed in the shell. The oil separation device also comprises a primary separation structure, a secondary filtration structure and a tertiary filtration structure which are arranged in the chamber body and through which the mixed gas sequentially flows; the primary separation structure is communicated with the gas inlet and comprises a plurality of flow channels which are communicated with each other, and the directions of the communicated flow channels are opposite; the secondary filtration structure is used for filtering the mixed gas which flows through the primary separation structure; the tertiary filtration structure is used for filtering the mixed gas which flows through the secondary filtration structure, and exhausting the filtered mixed gas from the gas outlet; and oil bodies obtained by separation of the primary separation structure, the secondary filtration structure and the tertiary filtration structure are drained through the oil return port.