The invention discloses a nuclear reactor container for loading high-temperature liquid, and belongs to the technical field of nuclear reactor design. A supporting mode of the nuclear reactor container is a double-sliding-rail hanging supporting system, the container freely slides in the ring direction and the radial direction by the aid of a first sliding rail and a second sliding rail between a container supporting lug seat and the concrete ground respectively, and the first sliding rail and the second sliding rail are mutually independent and can be interchanged. Heat expansion freedom degrees of the nuclear reactor container in any directions are released, and safety of the nuclear reactor container is improved.