The invention provides a control method for an indoor unit of an air conditioner and the indoor unit of the air conditioner. The indoor unit of the air conditioner comprises a machine shell, a first air supply fan, a second air supply fan, an indoor heat exchanger and a fresh air device, wherein the first air supply fan and the second air supply fan are arranged in the machine shell, the indoor heat exchanger is arranged on the air inlet flow path of the first air supply fan and the second air supply fan, the fresh air device is used for guiding outdoor air to the upstream of the indoor heat exchanger, and the distance of a fresh air outlet of the fresh air device from an air inlet of the first air supply fan is larger than the distance from the air inlet of the second air supply fan. Thecontrol method comprises the following steps that when the indoor heat exchanger works, outdoor environment temperature and indoor environment temperature are obtained; whether the indoor environmenttemperature is closer to the user expected temperature is judged; if yes, the fresh air device is started, and the rotating speed of the first air supply fan is enabled to be larger than the rotatingspeed of the second air supply fan; if not, the fresh air device is started, the rotating speed of the first air supply fan is enabled to be smaller than the rotating speed of the second air supply fan, so that comfortable air supply is achieved, and electric energy is saved.