The invention relates to a tenon engraving machine. A left convex part is arranged at the left side of the front end surface of a stand, a right convex part corresponding to the left convex part is arranged at the right side of the front end surface of the stand, and a groove is formed among the front end surface, the left convex part and the right convex part of the stand; the front end surface of the stand is provided with a positioning part; and in addition, an inverted U-shaped hanging bracket which can move back and forth and oppositely parallel to the stand is arranged on the stand, a cutter seat which can slide left and right opposite to the hanging bracket is arranged on the hanging bracket, and a cutter is arranged below the cutter seat. Thus, when an article to be processed is located on the positioning part at the front end of the stand, a tenon joint on the article to be processed can be cut by moving the cutter.