Energy-saving environment protection ventilating machine

The utility model relates to an air exchange system, which is used for purifying outdoor air and adopts the air heat exchange mode. The utility model in particular belongs to an energy-saving air exchange unit friendly to the environment. The air exchange system comprises a box body, an air supply pipe from outdoors to indoors and an exhaust pipe from indoors to outdoors. The air supply pipe and the exhaust pipe are arranged in the box body. The exhaust pipe intercrosses with the air supply pipe to form a heat exchanger core; a ventilator is arranged on the exhaust pipe and the air supply pipe respectively, which is provided with filtration cotton on the exhaust pipe and the air supply pipe respectively. The inlet end of the air supply pipe is provided with a temperature sensor; the outlet end of the air supply pipe is provided with an ultraviolet lamp. The ventilators, the temperature sensor and the ultraviolet lamp are electrically connected with a controller. The air exchange system has the advantages that