The invention discloses an energy-saving indoor purifying
system. The energy-saving indoor purifying
system comprises a box body, a first primary-efficiency filter, a heater, a surface cooler, an airsupplying fan, a humidifier, a medium-efficiency filter, a
fresh air pipeline, an air return pipeline, an air supplying pipeline, a high-efficiency filter, an air exhaust pipeline, a second primary-efficiency filter and an air exhaust fan. According to the energy-saving indoor purifying
system provided by the invention, outside
fresh air and indoor returned air can be mixed to obtained mixed air,then, the mixed air is subjected to primary filtering, heating, heat exchange, humidifying, medium-efficiency filtering and high-efficiency filtering, accordingly, air entering a room can be purified,particulate matter in the air is efficiently and thoroughly filtered, returned air is recycled, thus, the
indoor air is purified, resource recycling is improved, and moreover, resource losses are avoided. In addition, when redundant
indoor air is exhausted, the exhausted air is filtered,
pollutant emission can be effectively decreased, and the requirements for energy saving and environment protection are met.