A full face respirator mask includes a ring-shaped frame, a transparent face plate connected to an inner periphery of the frame, an air inlet extending through the face plate, and a cushion integrally molded to the frame and having an abutment portion. The frame has top, bottom, left and right parts. At least one protruding plate extends rearwardly and horizontally from the top part. The at least one protruding plate is embedded in the cushion body to push the abutment portion to abut tightly against the face of a user when the full face respirator mask is positioned on the face of the user.