The invention provides a sharpening device mainly suitable for scissor blades for garden clipping. The sharpening device can achieve accurate locating and automatically adapt to blades. The sharpening device comprises a blade, a grinding wheel assembly, a cutter holder assembly and a transmission assembly. In the earlier stage, a blade sharpening line acting on the whole sharpening work needs to be adjusted and located; after the blade is located to the cutter holder assembly, it is declared that the early manual precision is completed; and the cutter holder assembly can automatically abut against the grinding wheel assembly, and then it is declared that determining of a sharpening station is completed. A specially-made clamp is utilized for clamping, fixing and locating different blades, the precision of locating and sharpening work can be further promoted, and then the beneficial effects that sharpening can be completed only through single-time feed, and the work efficiency is improved are brought.