This product is composed of a mask body, a plastic nose clip and a mask belt; the mask body is composed of an inner and outer layer of non-woven fabric and a middle layer of polypropylene meltblown non-woven fabric; the mask belt is elastic or non-elastic. The product should be sterile. It is worn by clinical medical staff during invasive operations and provides a physical barrier to prevent the direct penetration of pathogenic microorganisms, body fluids, particles, etc.