In light of low reliability, high drilling cost and environmental pollution with diesel driven deep drilling rig, this paper puts forward an energy-saving and environment-sound upgrading scheme for transforming the drilling rig from traditional diesel-drive into electric-drive. Industrial power grids was directly used as power supply to optimize the power drive system of the drilling rig. Extensive application in deep well drilling such as geothermal wells oil wells, has proved that the upgrading from diesel drive to electric drive has resulted in energy saving and environmental protection, and improved the reliability, superiority, economics and safety of drilling rig operations, achieving the desired purpose.