This paper introduces the origin of face covering paper in Han nationality's funeral custom.

There are many explanations about the origin of the face-covering paper:

Most people believe that the face-covering paper is a paper separated by yin and yang. If you don't use the face-covering paper to separate yin and yang after death, the dead will not be able to enter heaven, even the terrifying one, and may become a lonely ghost.

First, it is to observe whether the deceased faked his death. If he faked his death, he will be angry and can be rescued.

It is said to keep out dust and prevent noise, which means to let the dead rest in peace.

There is also a saying that after the demise of the Ming Dynasty, the old people of the Ming Dynasty felt ashamed to see their ancestors after their death, so they ordered future generations to cover the faces of the deceased with paper, which became a custom over time. This is by no means the origin of face-covering paper. I believe in the first three.