The invention relates to a novel aluminum alloy fireproof window. The window comprises a window frame, a sash and a glass support. The window frame is clamped to clamped fixing elements and installed on a wall through an expansion screw. The window frame is connected with the sash through pin shaft hinges, the glass support is installed on the sash, the window frame and the sash are both internally provided with a hollow cavity, and window mullion supports are arranged in the hollow cavities. The hollow cavities are formed in the window frame and in the sash, and good heat insulation performance is achieved. By means of the pin shaft hinges, the defect that air tightness is low because sealing rubber strips are cut off on hinge portions can be effectively overcome. The clamping fixing elements are connected with the window mullion supports through screws, and it is guaranteed that when fire breaks out, the whole window cannot fall apart due to melting of aluminum profiles. The whole structure is reasonable, on the premise that low cost of whole window materials is fully considered, air pressure resistance, air tightness of the whole window and water tightness are improved to a certain extent, and practicality is extremely good in the aspect of fire resistance integrity.