Abstract: An osteotome for transcrestal sinus floor elevation includes a working portion and a handle. A notch is provided on the working portion for peeling off maxillary sinus floor mucosa all around to enlarge a lifting scope of maxillary sinus floor. An end surface of the working portion is a plane. The end thickness of the working portion is from 0.3mm to 1.5mm. By the notch, the working portion is changed to be semi-cylindrical or incomplete cylindrical; while lifting the maxillary sinus through the improved osteotome, under the premise of preparing the implanting tooth crypt holes with the same diameter, the osteotome is capable of peeling off the sinus floor mucosa all around after going deep into the maxillary sinus, to enlarge the lifting scope of the maxillary sinus floor, thus the elevation amplitude of the maxillary sinus floor is improved.