Fresh air ventilator having dehumidification function

The invention provides a fresh air ventilator having a dehumidification function. The fresh air ventilator comprises a housing, a fresh air ventilator core, an indoor air charging pipeline, an indoorair discharging pipeline, an outdoor air charging pipeline and an outdoor air discharging pipeline, wherein the fresh air ventilator core is arranged inside the housing; the indoor air charging pipeline and the indoor air discharging pipeline are arranged on the housing and are correspondingly connected with the fresh air ventilator core; the indoor air discharging pipeline is connected with the fresh air ventilator core through an exhaust fan; a dehumidification chamber is arranged between the exhaust fan and the indoor air discharging pipeline; a dehumidifying pipe is arranged inside the dehumidification chamber; two pipe openings of the dehumidifying pipe correspondingly communicate with a cold water tank arranged at the top of the housing to form a loop; the body of the humidifying pipe penetrates into the top