The present invention discloses a knit hat with a mask. A knit hat is provided, a hook groove is provided in a bottom portion of the knit hat, a mask is provided under the knit hat, and a button is provided at a top end of the mask. Connected to the hook groove, a cleaning chamber is provided in the mask, an adsorption device is provided in the purification chamber, and a cleaning device is provided in the adsorption device. A positive / negative chamber is provided in the wall, a switching device is provided in the positive / negative chamber, a driving device is provided in the purification chamber, and the driving device is located in the purification chamber. A belt chamber is provided in the left wall of the positive / negative chamber, a main shaft is provided in the belt chamber, and the main shaft and the vane are fixedly connected to each other. [Selection diagram] Figure 1
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