The invention relates to a special mask for preventing haze, and belongs to the field of protective appliances for everyday life of people. The special mask comprises a silicone face mask, filter mounting seats, PM.2.5 (Particulate Matter 2.5) filters, fixed belt fastening parts, exhalation valves, a mask body, inhalation valves and filtering layers; the mask body is arc-shaped, and the filter mounting seats are symmetrically mounted on the mask body; the exhalation valves are mounted on the cover body at the upper parts of the filter mounting seats; the inhalation valves and the PM2.5 filters with the filtering layers are mounted on the filter mounting seats; the fixed belt fastening parts are movably mounted at two sides of the mask body. According to the special mask for preventing the haze, the structure that an exhaling channel, filters and an inhaling channel are separated is adopted, and thereby, smooth airflow is ensured, a user can breathe smoothly after wearing, the mask can fit the face well, the sealing effect is great, the inhaled air can be completely filtered before entering a human body, and as a result, good haze preventing effect is realized. With the adoption of the special mask for preventing the haze, the problems of the existing haze mask that the mask cannot tightly fit the face of a people, obvious haze preventing effect is not realized, and people feels oppressed and uncomfortable after long-time wearing, can be solved.