Screen window and door window combined structure with function of preventing rainwater from flowing backwards

The utility model belongs to the technical field of aluminum profile doors and windows, and particularly relates to a screen window and door window combined structure with a function of preventing rainwater from flowing backwards. According to the utility model, the perforated door and window sash unit on the outer side and the screen window sash unit on the outer side are arranged on the perforated fixing frame unit, so that the screen window and door and window combined structure has the functions of preventing rainwater from flowing backwards and preventing mosquitoes. The utility model has the following advantages: firstly, the fixing frame unit with holes and the door window sash unit with holes ensure smooth and rapid drainage of rainwater; the fixing frame unit with the holes is provided with an inner side protruding part which is low in outside and high in inside, and the basic function of preventing rainwater from flowing backwards is guaranteed; and thirdly, the perforated door and window sash unit