The utility model relates to a PPH auxiliary instrument tightly attached to an anal tube. The PPH auxiliary instrument tightly attached to the anal tube comprises an anal tube expander body and an on-hemorrhoid mucous membrane protection plate. The anal tube dilator body is matched with an on-hemorrhoid mucous membrane protection plate; wherein the anal tube dilator body comprises an anal dilatingpart and a limiting part; the inner side surface of the main body plate is a concave arc-shaped surface; the radian of the concave arc-shaped surface is consistent with that of the anus expanding part; the outer side surface of the outer side plate is a convex arc-shaped surface; and the radian of the convex arc-shaped surface is consistent with that of the limiting part. The PPH auxiliary instrument tightly attached to the anal tube has the advantages that due to the fact that the hemorrhoid mucous membrane plate is designed to be in an arc shape, the PPH auxiliary instrument can be tightlyattached to an anal tube expander, and the rectum mucous membrane protection effect is good.