The utility model relates to a plug-in type aluminum alloy broken bridge heat insulation window sash. The window sash comprises an outdoor frame, an indoor frame and a heat insulation strip connectedbetween the outdoor frame and the indoor frame. Inserting strips are arranged on the two sides of the heat insulation strip; inserting grooves matched with the inserting strips are formed in the corresponding positions of the outdoor frame and the indoor frame. A first clamping protrusion is arranged on one side of the inserting strip, a limiting table is arranged on the opposite side of the inserting strip, the inserting groove comprises an anti-disengagement strip and a supporting block which are arranged in a spaced mode, a first clamping groove matched with the first clamping protrusion isformed in the inner side wall of the anti-disengagement strip, and the outer end of the supporting block makes contact with the limiting table to form a limiting structure. The indoor frame, the outdoor frame and the heat insulation strips can be prefabricated, surface treatment can be conducted independently when assembling is needed, any part cannot be damaged during assembling, original performance is kept, the assembling process is greatly simplified, and the quality of finished window sashes is improved.