Cantilever pouring continuous beam mid-span Helong is the key point of continuous rigid bridge construction control, but there are still many drawbacks of conventional locking Helong technology. Therefore, it is necessary to study more advanced and efficient locking Helong technology, and the construction technology of 220 m cantilever poured concrete was combined with the main span of the Peng'an Jialing River Three Bridges to carry out research, and a one-way automatic limit rigid skeleton locking Helong construction technology was proposed. The design of temporary locking of the middle span Helong was optimized, and the measurement, stress, temperature, etc. were strictly monitored before the temporary locking construction, so as to effectively solve the construction technical problems such as the rigid skeleton and system conversion of the closing section, and provide reference for similar engineering construction.