The invention discloses a rigid framework continuous beam sidespan construction technology. The technology comprises the processes that 1, pier top beam section construction is conducted; 2, synchronous construction of sidespan cast-in-place sections and sidespan cantilever sections is conducted, specifically, a attaching-type high-altitude assembling bracket is adopted to conduct construction onthe sidespan cast-in-place sections, and a double-limb triangular hanging basket is adopted to conduct construction on the sidespan cantilever sections simultaneously; a main truss of the double-leg triangular hanging basket comprises two truss groups symmetrically distributed and arranged on the upper portions on the left and the right of the cantilever sections, and each truss group comprises two triangular trusses distributed and arranged side by side; the attaching-type high-altitude assembling bracket comprises a high-altitude bracket located on the inner side of bridge piers and a plurality of attaching-type connection structures distributed and arranged from top to bottom; and 3, sidespan folding is conducted. According to the rigid framework continuous beam sidespan construction technology, design is reasonable, construction is easy and convenient, the using effect is good, after pier top beam section construction is finished, while the double-leg triangular hanging basket is adopted to conduct construction on the sidespan cantilever sections, the attaching-type high-altitude assembling bracket is adopted to conduct construction on the sidespan cast-in-place sections, and the high-altitude large-tonnage sidespan beam section construction process can be conveniently and quickly finished.