Disclosed is an assembled machining shed for building construction. The machining shed comprises m groups of assembled T-shaped supporting body steel structures, n same specifications of trusses a and a shed cover, wherein m is not less than 2 and not more than 10 and n is not more than 5; every group of assembled T-shaped supporting body steel structure comprises a vertical supporting column, a beam and two inclined pull rods, wherein the beam is formed by two trusses and the two inclined pull rods are connected with the vertical supporting column and the beam to form a T-shaped supporting body; vertical trusses, edge sealing trusses and horizontal across trusses are connected between the m groups of assembled T-shaped supporting body steel structures through connecting parts and bolts to form an integral structural frame, wherein the vertical trusses and the edge sealing trusses are formed by the trusses a and the horizontal across trusses are connected with the vertical trusses and the edge sealing trusses; an angle steel auxiliary keel and the shed cover are arranged on the structural frame; the vertical supporting columns of the m groups of assembled T-shaped supporting body steel structures are fixed on the concrete foundation through embedded foundation bolts; 2 m or less 10 or less, 5 n or less. According to the assembled machining shed for the building construction, the structure is safe, stable and reliable, the parts are assembled through the bolts, and accordingly the component machining and the integral detachment, installation and conveying are convenient.