The invention relates to a hollow metal sealing structure. The hollow metal sealing structure comprises an upper flange, a lower flange and a sealing ring, wherein the upper flange and the lower flange are connected to form a flange structure, and the lower flange is connected with a to-be-sealed component; and the sealing ring is arranged in a groove formed in the surface of the lower flange andis used for sealing the space between upper flange and the lower flange so as to form a sealing structure between the flange structure and the to-be-sealed component. Aiming at the defects of a metalsealing structure in the prior art, the sealing structure is innovatively designed from the aspects of structures, materials, performance and the like, particularly sealing rings; by virtue of the requirements on the material performance, welding lines, coatings and the like of the sealing ring, the integral sealing structure has excellent sealing performance and high reliability, the sealing ringcan be used in a wide temperature range of -196 to 227 DEG C and can be repeatedly and circularly used in a temperature range from -196 DEG C to the room temperature.