The invention provides a gum beautifying marker capable of rapidly and accurately positioning the summit position of the edge of gum. The marker comprises a transverse narrow scale used for correspondingly measuring the width of dental crown and a vertical narrow scale used for correspondingly positioning the summit position of the edge of the gum; the vertical narrow scale perpendicularly intersects with the transverse narrow scale; and the length of the transverse narrow scale is 75% of the length of the vertical narrow scale. The gum beautifying marker effectively helps a doctor to judge the clinic tooth crown length and the biological width in the tooth crown lengthening surgery, accurately judges the gum edge summit position and the corresponding alveolar ridge crest position needed by the surgery through adjustment, judges the gingival papilla summit position and the corresponding alveolar ridge crest position needed by adjustment, is simple and convenient to use, has low manufacturing cost, and can be widely promoted and used.