The invention relates to clothes with haze-preventing function. The clothes comprise a front body part, a rear body part, sleeves, pockets and a hat, and further comprise a bi-layer haze-preventing hat mask. The upper end of the hat mask is sewn together with the hat, the lower end of the hat mask is sewn together with the upper end of the front body part. After the clothes are worn by people, a filter screen is added to the nose and mouth part of the haze-preventing hat mask and fixed between the inner layer and the outer layer of the haze-preventing hat mask. Air-vents are arranged in the inner layer and the outer layer, of the haze-preventing hat mask, corresponding to the two sides of the filter screen. Compared with the prior art, the clothes can prevent inhaling of haze, and has good waterproof and ventilating performance. The clothes can be worn when doing excise in haze days, and can be used as special outdoor mountaineering jackets for travel. The application scope of the clothes is wide.