The utility model discloses an assembled milling cutter, belonging to the technical field of machining. The assembled milling cutter comprises two cylindrical cutter seats which are vertically connected to the sidewall of a conical handle, wherein grooves for clamping two milling cutters are formed in the cutter seats along the radial direction, locating bolts for locating the milling cutters are mounted on the cutter seats in a penetrating manner, adjusting nuts are connected to the external walls of the lower parts of the cutter seats through threads, and the front part of the conical handle is provided with a locating rod. According to the assembled milling cutter, the two cutter seats are arranged, the adjusting nuts are connected to threaded positions of the external walls of the cutter seats, and the height of the two milling cutters can be respectively adjusted through the nuts, so that the aim of once-grooving completion is achieved, and working procedures for milling cutter disassembly and assembly are reduced; the assembled milling cutter is suitable for machining welding grooves of different calibers, and is simple in structure, convenient in disassembly and assembly, high in machining accuracy and high in production efficiency.