In the geological exploration of solid mineral resources in China, diamond drilling is a main drilling method. In the diamond drilling, rock fragmentation is mainly realized by the diamonds set in bit crown. Along with the rock fragmentation at the bottom hole and the borehole depth increasing, the diamond face exposure is worn, which has direct influence on drilling rate and bit footage until the bit is discarded. Therefore the sharpening of the diamond face exposure should be paid a special attention. Russian doctor Спирин В.И. and some others have made a lot of studies on sharpening the diamond face exposure by using electrochemical principle in order to improve the penetration rate and bit footage; and based on this principle, the portable diamond bit electrochemical sharpening device has been developed for field application with very good technical and economic effects.