The semi-automatic kn95 mask production line is mainly a semi-automatic production line for kn95 masks. The machine is composed of a chipping machine, an ultrasonic welding ear belt machine and a blank holder machine. Two layers of non-woven fabric, two layers of melt blown fabric and one layer of hot air cotton are used for unwinding of the front-end tablet maker. According to the demand, it can be formed by knurling and cutting twice, and the built-in nose bar can be automatically pierced. After the back-end blank holder is completed, the welding lug belt station and blank holder forming station are connected, and the finished kn95 mask is completed.