Disclosed is a nitrogen-fixing low-temperature container for a force-bearing superconducting magnet. A support is arranged between an inner cylinder and an outer cylinder to form a vacuum interlayer;an anti-radiation material and a heat insulation material are filled in the vacuum interlayer; a superconducting magnet framework is fixed on the inner wall of the inner cylinder; a liquid nitrogen inlet and outlet pipe is communicated with the inner cylinder; a liquid nitrogen box is arranged in the vacuum interlayer; a lower transition pipe, a lower low-temperature container cover and a lower non-magnetic metal conduction block are welded into a whole and then are fixed at the opening of the top of the inner cylinder; an upper transition tube, an upper low-temperature container cover and a refrigerating machine upper flange are welded into a whole and then are fixed at the opening of the top of the outer cylinder; a lower flange of the refrigerating machine and the upper non-magnetic metal conduction block are welded at the upper and lower ends of a telescopic elastic corrugated pipe; and the upper non-magnetic metal conduction block and the lower non-magnetic metal conduction blockare in a contact state when the refrigerating machine performs cooling, and are in a separated state after cooling of the refrigerating machine is completed. According to the container, the low-cost nitrogen-fixing low-temperature medium can be provided for cooling the superconducting magnet, the cold head of the refrigerating machine can be plugged and pulled, the structural force bearing performance is high, the heat insulation performance is good, and the like.