Provided is a high-temperature-resistant casing structure used for an aero-engine. The high-temperature-resistant casing structure used for the aero-engine comprises a rectification blade grid and inner ring casing welding assembly, an outer ring casing assembly, a spherical air-entraining joint nozzle and sealing pieces. The rectification blade grid and inner ring casing welding assembly is composed by welding a rectification blade grid, an inner ring casing and a collector box together. The outer ring casing assembly is composed of an outer ring casing front segment, an outer ring casing back segment and connecting pieces used for connecting the outer ring casing front segment with the outer ring casing back segment. The high-temperature-resistant casing structure used for the aero-engine has the advantages that it is ensured that a casing has the good testability in a high-temperature zone; visual measurement requirements of critical parameters such as temperature and pressure in the position of an outlet of a core engine for the aero-engine are met; the problem that the rectification blade grid is incongruous with the thermal deformation of the inner ring casing and an outer ring casing is solved; the purposes of cooling the casing structure through air-entraining and sealing and keeping air system flow paths are achieved; the structure is reasonable; processing is convenient; the assembling and disassembling processes are free of interference; the structure is resistant to high temperature, good in stiffness, long in service life, high in reliability and high in practicality and can be used repeatedly.