The invention provides a rough and finish milling combined machining tool. The rough and finish milling combined machining tool mainly comprises a base (1), a base guide rail (2), a tool body (3), a stand column (10), a top beam (7), a second servo motor (8), a spindle motor (6), a replaceable spindle box (5), a tool head (4), a support (11), a lifting oil cylinder (12), a foot pad (9) and other components. By means of the machining tool, the machining efficiency and the machining quality of milling of the surfaces of workpieces can be greatly improved.