The utility model relates to the technical field of hedge trimming. The utility model provides a hedge trimming device. The hedge trimmer comprises a mounting frame, a lifting mechanism and a telescopic mechanism are arranged on the mounting frame, a first hedge trimmer body is horizontally mounted on the lifting mechanism and used for enabling the first hedge trimmer body to move vertically, anda second hedge trimmer body and a third hedge trimmer body are vertically mounted on the telescopic mechanism and used for enabling the second hedge trimmer body and the third hedge trimmer body to move horizontally. The operation height of the first hedge trimmer which is horizontally mounted is adjusted by arranging the lifting mechanism; the first hedge trimmer and the second hedge trimmer which are vertically installed are adjusted through the telescopic mechanism so as to adapt to the width required by hedge trimming, the structure is simple, operation is convenient, manpower and materialresources are saved, the trimming operation efficiency is improved, and the trimming effect is tidy and attractive.