Building template for concrete building

The utility model discloses a building formwork for concrete building, which comprises a combined steel formwork and a support system arranged on the periphery of the combined steel formwork, the combined steel formwork comprises corner columns located at corners, splicing plates are arranged between the corner columns, and the corner columns and the splicing plates are detachably connected through inserting structures. The corner column and the splicing plate are directly spliced through the inserting structure, the sledge groove used for splitting is formed in the corner column or/and the splicing plate, and when the formwork is disassembled, a crowbar is used for being matched with the sledge groove so that the corner column and the splicing plate can be directly split. The corner columns and the splicing plates are the same in thickness, the supporting system is arranged on the peripheries of the corner columns and the splicing plates, and the corner columns and the splicing plates can be firmly supported