Abstract: Subgrade construction is an important part of road engineering. The quality, bearing capacity and structural stability of subgrade will directly affect the quality, performance, service life and safety and stability of road engineering. The bearing capacity of the soft soil subgrade itself is insufficient, and appropriate methods should be adopted to reinforce it to ensure the stability, safety and reliability of the subgrade. This paper mainly analyzes the main points and key points of soft foundation reinforcement construction technology in road engineering construction, hoping to provide some inspiration for improving the construction level and quality of soft soil road foundation and promoting the smooth progress of road engineering construction.