Abstract:In the developed intelligent prestressed tensioning device based on servo valve control technology, the tension of prestressed concrete beam, data transmission, monitoring, management, and other functions were integrated, the electro hydraulic servo control technology with independent intellectual property rights was used to control the pressure and flow of the servo system, then the functions including constant speed pressurizing, constant speed pressure relief, grading pressure holding were realized.Servo motor was adopted as power source to realize stable control to oil pump,so the disadvantage that the original variable frequency motor could not achieve low speed control under high pressure due to the small torque under low speed was resolved.