The invention relates to aluminum steel compound door windows, in particular to a multi-functional steel-aluminum composite door window system. The multi-functional steel-aluminum composite door window comprises a window frame, a middle stile, a window sash frame and supporting glass, a lock and hinges, and the window frame and the window sash frame are connected through the hinges; and window frame profiles, middle stile profiles and window sash profiles comprise broken bridge aluminum profiles and steel skeletons, the steel skeletons penetrate into the broken bridge aluminum profiles, fixedscrews are hammered on the surfaces of the steel skeletons in a whole row mode, finally, surface decoration aluminum profiles penetrate to form a steel-aluminum composite profile, middle stile connecting pieces at the crisscross place of the middle stile are connected with through middle stile pulling rods and eccentric screws. According to the multi-functional steel-aluminum composite door windowsystem, the cost is low, environmental protection is achieved, and the door window system design of multiple functions of heat preservation, heat insulation, sound insulation, water resistance, fireprotection and the like is achieved; and the door window system is attractive and elegant, sturdy and durable, various in function, environmentally-friendly in material and recyclable, and confirms tothe regulatory requirement of nation for green buildings.