The invention discloses a fresh air heat recovery device for an ultra-low energy consumption building. The device comprises a fresh air outlet, an exhaust inlet, an exhaust outlet, a fresh air inlet and an energy recovery assembly, wherein the fresh air outlet adopts the energy recovery assembly and the fresh air inlet to form an independent passage, the exhaust inlet adopts the energy recovery assembly and the exhaust outlet to form an independent passage, the energy recovery assembly is used for exchanging and recovering energy in two independent passages. According to the device, when heatrecovery is carried out, fresh air enters a main pipe from the fresh air inlet, then enters different containing pipes through a plurality of flow dividing pipes and air jet seats at the end parts ofthe flow dividing pipe, so that the fresh air is divided into multiple flows to be blown to the surfaces of straight pipes and bent pipes I in the different containing pipes, and the heat exchange andrecovery efficiency is improved; and in addition, part of the fresh air is stored in a temporary storage tank, and a bent pipe II in the temporary storage tank is further attached with an adhesion sheet to further improve the efficiency.