Abstract: Intelligent control system of high strength bolt twisting torque for railway bridge was built based on the Internet of Things. Through the constant torque wrench with built-in torque and temperature and humidity sensors and two-dimensional code scanning device, and numerical control system including basic information, construction plan, quality inquiry, inventory management and other functional modules, high-strength bolts can be accurately tightened and avoid the super tighten or less tighten. The engineering application shows that the deviation between the construction output torque and the set torque of the intelligent control system of high strength bolt twisting torque for railway bridge is within ±4%, the average value of the ratio between the construction output torque and the set torque is 0.996, and the standard deviation is 0.015. The use of the intelligent control system of high strength bolt twisting torque can obtain high-precision and stable construction output torque. The system can completely and efficiently record high-strength construction information, understand construction status of bolt in real-time, count and analyze the construction quality at any time, reduce the probability of delayed fracture caused by super tighten.