The utility model discloses a concrete-filled rectangular steel tube structure of a stiffening rib with trapezoidal openings, which is formed by filling the concrete into a rectangular cross-section steel tube with a longitudinal stiffening rib. The longitudinal stiffening rib of the rectangular steel tube is provided with trapezoidal openings which are distributed in a wave form, and the wave crest is welded with a wall plate of the steel tube. The concrete-filled steel tube structure has the advantages that the compression performance is effectively improved, the shock resistance is improved, the manufacture process is simple, the steel tube is convenient to manufacture by the plant, the construction quality for welding the rectangular steel tube is less influenced by personal factors, the welding stress is reduced due to the design of the trapezoidal openings, the 'sealed trapezoidal openings' are formed by the trapezoidal openings and the wall plate, and the compression performance of the two materials of the concrete-filled rectangular steel tube is effectively improved. In addition, the size and the beta angle of the trapezoid can be chosen by the structure according to the types and the maximum grain size of aggregate used by the concrete, and the adaptability to the different concretes is enhanced.