Sealing structure of cylinder head

The invention provides a sealing structure of a cylinder head. The sealing structure comprises the cylinder head, cylinder sleeves and crankcases. The cylinder head is of a cap type structure with a pit formed in the bottom of the inner side. The tops of the crankcases are of overall plane structures and are not provided with cylinder sleeve seat holes. The crankcases are arranged in the cylinder sleeves. The tops of the cylinder sleeves are provided with flanges of step-shaped circular ring structures. The bottom faces of the flanges are in direct contact with the planes of the tops of the crankcases. The bottom of the cap type structure of the cylinder head is directly pressed to be in contact with the step-shaped circular ring structures on the cylinder sleeves. Compared with the prior art, the sealing structure has the beneficial effects that a cylinder head sealing technology in which a cylinder cushion does not exist is adopted, due to the fact that the cylinder sleeves are directly placed on top plates of the crankcases, high-pressure sealing between the cylinder head and the cylinder sleeves is achieved based on the principle of stress of the structure and yield deformation of materials, and sealing is reliable.