The invention discloses a welding corner column. The welding corner column comprises a first H-shaped component, a T-shaped component arranged on one side of the first H-shaped component, and a second H-shaped component, wherein the two ends of the second H-shaped component are correspondingly connected with the first H-shaped component and the T-shaped component through webs, a partition plate is arranged among the first H-shaped component, the T-shaped component, the second H-shaped component and the webs, and a frame body is defined by the first H-shaped component, the T-shaped component, the second H-shaped component, the webs and the partition plates. The welding corner column is firm in structure and good in bearing capacity, and guarantees the quality of a whole project. According to a manufacturing method of the welding corner column, by adjusting the technological manufacturing scheme and changing a welding groove, a welding sequence and a welding manner, the manufactured giant welding corner column has the characteristics of small welding deformation, high component precision, firm structure and the like, streamlined production of the giant welding corner column in a factory is basically realized, and the production efficiency is improved.