The invention discloses a cold and warm air blower with a fresh air function and an air-source heat pump. The cold and warm air blower is characterized in that a compressor is connected with a four-way valve by two connecting pipes, the four-way valve is connected with a surface air cooler I and a surface air cooler II by two other connecting pipes, the surface air cooler I is connected with the surface air cooler II by a connecting pipe with capillary pipes, water collecting grooves are formed in the bottom of the surface air cooler I and the bottom of the surface air cooler II, drain pipe connectors are mounted on a shell and are communicated with the water collecting grooves, and tiny induced air openings are formed in the shell and correspond to an air return cavity; a fan motor is arranged on a partition plate, and two fans which are driven by the fan motor are respectively positioned in the air return cavity and an air supply cavity; an air supply connecting pipe is arranged on the shell and corresponds to the air supply cavity. The cold and warm air blower has the advantages that the cold and warm air blower is simple in structure and low in manufacturing cost, and indoor circulating air can flow through the evaporating surface air coolers in summers after being filtered, flows into distributed air channels after being cooled or can be freely blown out; conversion effects can be realized by the four-way valve in winters, air flowing modes in winters are consistent with air blowing modes in summers, and accordingly circulating spaces can be heated in a circulating manner.