A manufacturing method of a steel beam with improved stiffness is provided to secure the easiness of manufacture and to increase stiffness effectively by using a vertical reinforcement board having a few welding parts. A manufacturing method of a steel beam(100) with improved stiffness, for manufacturing a steel beam by connecting segmented steel beams composed of an upper flange(110), a web(120) and a lower flange(130), comprises the steps of keeping a steel beam to be supported in the simply supported type and curved downward with deadweight, fixing a first vertical reinforcement board(210) to be projected upward on the upper side of an upper flange of a steel beam, and overturning the steel beam integrated with the first vertical reinforcement board to be supported simply, and fixing a second vertical reinforcement board(220) to be projected upward on the upper side of a lower flange of the steel beam.
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