The utility model discloses an ultra-deep well mandrel type sleeve hanging device. The ultra-deep well mandrel type sleeve hanging device is designed for solving the problem that seal loses effectiveness due to the fact that seal of a hanging device is in heavy burden. A running tool of the ultra-deep well mandrel type sleeve hanging device is inwards connected with a hanging device body, rubber auxiliary seal which is composed of a base plate, a rectangular rubber seal ring and a pressing plate is installed outside the hanging device body in a sleeved mode, and metal primary seal which is composed of a primary seal backing ring, an X-shaped metal sealing element, a primary seal supporting ring and a cap is installed on the hanging device body in a sleeved mode. The weight of a sleeve is used for exciting deformation of the X-shaped metal sealing element to carry out the metal primary seal, and extra weight is transmitted to the primary seal supporting ring after the metal primary seal is carried out, and is transmitted to a casing head body. A screw is screwed down to excite deformation of the rubber seal ring to carry out rubber auxiliary seal, and the rubber auxiliary seal plays a role in assistance of seal. The ultra-deep well mandrel type sleeve hanging device can solve the problem that the seal loses effectiveness in an ultra-deep well due to the fact that hanging load of seal of the hanging device is excessively large, and is good in seal effect, convenient to operate, and safe and reliable in remedial measure, and the service life is remarkably prolonged.