The invention relates to the field of construction formworks and aims to provide a building pouring formwork. The building pouring formwork comprises a top plate, a shear wall, a first side wall, a second side wall, stand columns and supporting columns, wherein the first side wall and the second side wall are vertically connected to the two sides of the shear wall and sequentially enclosed, the top plate is horizontally overlapped on the upper portion of the shear wall, the upper portion of the first side wall and the upper portion of the second side wall, the supporting columns are vertically fixed below the top plate, the length of the second side wall is smaller than that of the first side wall, and the stand columns are arranged below the vertex angle of the portion, outside the second side wall, of the top plate. The building pouring formwork has the advantages that the pouring formwork is of an overall detachable structure and can be disassembled and recovered after being used, the building pouring formwork is convenient to use, saves time and cost and can be used multiple times, and processing and forming efficiency of cement buildings is greatly improved.