The invention discloses a filtering structure for a heat exchanger. The heat exchanger comprises two sets of intersecting air ways. One set of air ways are connected with a hot air way, and the other set of air ways are connected with a cold air way. The filtering structure is arranged at the hot air inlet of the heat exchanger. The filtering structure is arranged between the hot air way and the hot air inlet of the heat exchanger in a push-pull mode. The filtering structure can effectively filter out impurities such as line scraps in the hot air way, the impurities such as the line scraps are prevented from entering the air ways of the heat exchanger, and air resistance is increased or blockage of the air ways is avoided; meanwhile, the filtering structure is set to be in the push-pull mode, the filtering structure is pulled out to be cleaned when multiple line scraps exist on the filtering structure or periodically, cleaning is convenient, and the internal structure of the filtering structure does not need to be disassembled.