Energy-saving economizer for exchanging fresh air for air conditioner

The invention provides an energy-saving economizer for exchanging fresh air for an air conditioner, and the energy-saving economizer comprises a shell; an air door is arranged at the ventilating side of the shell; a left mounting hole and a right mounting hole are respectively and symmetrically arranged on fixed plates at the two ends of the shell; the two ends of the air door are respectively and movably connected with the shell by virtue of the left mounting hole and the right mounting hole; and a button used for opening and closing the air door is arranged at the outer side of one end of the air door. The fresh air can be exchanged by manually opening the air door of the economizer, so that the energy-saving working mode of still refrigerating when a compressor of an air-conditioning system is stopped can be realized; and the energy-saving economizer has the advantages of being low in cost, energy-saving and environmentally-friendly.