In order to solve the problem that the subjective control of artificial tensioning in the traditional anchoring tensioning system is arbitrary, which is easy to cause the prestressed construction quality to be greatly affected by external factors, the pretension method combined with intelligent tensioning system is used to realize the automatic tensioning control of prestressed anchor cable to improve the tensioning quality and efficiency. Combined with TB Hydropower Project, this paper introduces the intelligent construction technology of prefabricated beams from the aspects of construction preparation, pedestal design and layout, prefabricated beams reinforcement lashing, bellows positioning and installation, formwork installation, steel strand installation and tension. It is considered that the construction of pretensioned prestressed beams through steel structure tensioning pedestal is simple, and the construction quality and durability of prefabricated beams are improved. The intelligent tensioning system can improve the tensioning quality through the real-time monitoring of the sensor, so that the prestressed tensioning can be completed safely with high quality and high standard.