The invention discloses an oil-gas separation device structure. The oil-gas separation device structure is characterized in that an oil-gas separation housing in the structure has labyrinth arrangement with the oil-gas separation effect, no labyrinth component needs to be added, the structure is simple, and parts are simplified; a rectangular gas inlet is formed in a baffle of an oil-gas separation oil collection chamber in the structure, the inlet direction of the gas inlet is far away from a camshaft and other motion pieces, and the situation that engine oil splashes into the oil-gas separation chamber when the motion pieces rotate can be avoided; an oil collection chamber is welded to the lower portion of the baffle of the oil-gas separation oil collection chamber of the structure, and collected oil drips can be made to flow back to an engine through a short pipe of the oil collection chamber; and damping bolt assemblies in the structure comprise damping gaskets, frameworks and mounting bolts.