Ventilation device for engine

The utility model discloses a ventilation device for an engine, which is composed of a cylinder head cap and a cover plate, wherein the cylinder head cap is separated by baffle plats to form two or more gas path grooves, the cover plate is combined with the cylinder head cap through locking parts, and at least one locking part is positioned on different plane from other locking parts. The cover plate is tightly matched with flanges of the baffle plates to form sealed gas paths in the gas path grooves, wherein at least one spoiler is arranged in each gas path groove of the cylinder head cap to form a labyrinth type gas path. The structure can improve economic performance of the engine, reduce oil consumption and the number of adding engine oil, prolong the service life of the engine, and can also reduce environmental pollution.