Abstract: The rural power grid transform project in Yuexi county town hydropower supply area is pressed for time. Station grid Yuexi Power Supply Corporation QC team studys one kind of portable devices for digging electric pole hole to solve the problem that the digging hole speed is low in mountain area. This kind of device can be used in different geographical environment. The work efficiency is increased, the numbers of workers is reduced and the working cost is down. At the same time the water mill pipe drill will not produce gravel splashing to hurt people compared to pneumatic pick digging. The security is higher.