Disclosed is a combined H-type steel core buckling-restrained supporting component. The combined H-type steel core buckling-restrained supporting component comprises a core material, end supporting joints, an outer sleeve, a sealing plate and filling materials. The core material is composed of a core segment located in the middle and connecting segments located at the two ends, wherein the cross section of the core segment and the cross sections of the connecting segments are respectively of an H shape, the core segment and the connecting segments are formed by splicing three independent H-type steel segments or formed by an integrated H-type steel segment, and the flange width of the core segment is smaller than that of each connecting segment. The cross section of each end supporting joint is of an H shape. Webs, close to the two ends of the core material, of the H-type body are cut off to form grooves with opposite groove openings, and the connecting segments of the core material stretch into the grooves and are welded to the grooves. The combined H-type steel core buckling-restrained supporting component solves the problem of bending of the connecting portions of the core material and the end joints of the supporting component and the technical problems of poor economy and manufacturing complexity of an existing support, and can be widely arranged between beam columns for building energy consumption.