Double-wall thermal-insulation steel silo

The invention discloses a double-wall thermal-insulation steel silo for storing foods. The lower part of a silo body is fixed on a support. The silo body comprises an inner plate and an outer plate which are interconnected through a bolt connecting pair. A thermal-insulation layer is clamped between the inner and outer plates, and a plurality of inner ring beams and a plurality of outer ring beams are arranged on the inner side of the inner plate and the outer side of the outer plate along a height direction respectively. The bolt connecting pair includes a special shaped double end stud and nut. The root of the thread at the two ends of the special shaped double end stud is respectively provided with a convex ring, an inner plate and an outer plate which respectively press out of the two convex rings of the special shaped double end stud. The nut presses the inner plate and the outer plate from the inside of the inner plate and the outside of the outer plate. The silo has a simple structure, saves use amount