The utility model discloses an energy -conserving al -alloy door & window, including double glazing, be equipped with the air bed between the glass, glass is equipped with fixed frame all around, the fixed frame outside is equipped with the fender bracket, the glass front side is equipped with the burglary -resisting window, board behind the fender bracket inboard is equipped with, the fender bracket front side is equipped with ahead board, back board front side is equipped with first cavity, first cavity front side is equipped with the second cavity, the inside connecting block that is equipped with of second cavity, second cavity inboard is equipped with first spread groove, second cavity front side is equipped with the third cavity, the inside baffle that is equipped with of third cavity, third cavity inboard is equipped with the second spread groove, first cavity, the second cavity and the third cavity outside are equipped with the fixed slot. The utility model discloses a setting of double glazing, bridge cut -off aluminium alloy, connecting piece and burglary -resisting window, can go on effectively energy -conserving, can guarantee like this the summer of sweltering heat basicity thermal -insulated effectively, carry out effectual heat preservation in chilly winter, accord with the demand of current social development.