A structure for connecting a beam of an aluminum alloy house to a wallboard, door and window. An aluminum alloy wallboard frame (2) is manufactured independently. An aluminum alloy exterior wallboard (5), a C-shaped steel frame member (23), a heat-insulating and fire-resistant calcium silicate board (21) and an interior decorative panel (20) are combined to form a modular assembled wallboard. The modular assembled wallboard fastens the aluminum alloy wallboard frame (2) onto an aluminum alloy beam (1) through a fastener. A head portion of an aluminum alloy sub-beam (12) is provided with an aluminum alloy sub-beam fixing aluminum angle (13). The aluminum alloy sub-beam fixing aluminum angle (13) and the aluminum alloy sub-beam (12) are fixed onto the aluminum alloy beam (1) through a fastener. An aluminum alloy door and window sub-frame (8) is connected to an aluminum alloy door or window frame (9) pre-installed with an aluminum alloy door or window sash (10) through a fastener. The structure has an easy connection, short construction cycle and convenient installation. Since the exterior wallboard contains heat-insulating and sound-insulating rock wool and the heat-insulating and fire-resistant calcium silicate board therein, the house has good performances of heat insulation and preservation, sound insulation, water resistance and fire resistance. The aluminum alloy door/window sub-frame is provided with a waterproof groove, thus increasing the water resistance performance of the door/window.