Indoor air exchanger

Disclosed is an indoor air exchanger, comprising a main air pipe whose outdoor end is provided with at least one set of first air ports and third air ports and the indoor end is provided with at least one set of second air ports and fourth air ports, and a plurality of heat conducting pipes arranged alternately are arranged in the main air pipe. The heat conducting pipes are connected between the third air ports and the fourth air ports, and air expelling devices with opposite air directions are respectively provided between the first air ports and the second air ports and between the third air ports and the fourth ports. Through a plurality of heat conducting pipes and heat radiating fins alternately arranged in the main air pipe, the fresh air in an air intake channel and the flowing waste air in an air-out channel can sufficiently exchange the energy, and the temperature of the air entering rooms can be approximate or equal to the indoor temperature so as to avoid the cold air or hot air entering the rooms when windows are opened to exchange the air in winter and summer. Thus, the device overcomes the defects of the prior art and can keep the indoor air pure; meanwhile, the device is also able to obtain the purpose of energy saving and heat insulation.