The operation of traditional water well drilling rig， such as pressure drilling， is greatly influenced by the operator’s experience， and the working environment and safety conditions are also poor. An TSJ-3000 water well drilling rig has been upgraded automatically to better meet the needs of the construction of middle-deep geothermal wells. The original equipment is not changed， and the driller’s room is added； The servo control system is used to realize the function of lifting and lowering the drill by the touch rocker and the function of automatic constant pressure drilling. Adopt automatic sensing shift module to realize quick shift and speed change in the driller’s room， so that the driller’s room is far away from the rig turntable； Using industrial control screen touch mode to integrate the main electric cabinet controller on site； Two independent operating systems， automation and manual operation， are realized. The field test and application show that the operation parameters of the drilling rig can be monitored and displayed in real time after the automation upgrade， which provides scientific basis for judging and preventing accidents in the hole. It can meet the requirements of lifting and tripping under the condition that the drilling tool of 3000 m water source drilling rig has a hanging weight of 800kN， and the drilling efficiency is 61% higher than that before the transformation. The labor intensity is reduced and the operating environment is improved. This project conforms to the development trend of automation， digitalization and intelligence of drilling equipment， and has a good application prospect.