A protective mask is revealed. The protective mask includes a mask body, a hoop mounted in the mask body, two angle adjustment members, and a head size adjustment device. The mask body is pivoted to the hoop and the hoop is adjusted by the head size adjustment device on a rear side of the mask body so as to fit head size of users. While being lifted, the angle of the mask body is adjusted and positioned by the angle adjustment members on left and right sides of the mask body. Thereby the protective mask can be applied to users with various head sizes. The users can wear the protective mask firmly and comfortably. Moreover, the angle adjustment of the protective mask is more convenient and simpler.
