The hydraulic dual wheel groove milling machine is widely recognized in the underground diaphragm wall project for its high precision,minimal soil disturbance,high efficiency,high groove forming accuracy,and wide applicability.However,due to different engineering requirements and objective environmental factors,corre-sponding measures need to be taken to ensure construction quality when using hydraulic dual wheel groove milling machines for construction.Based on years of engineering construction experience,,this article briefly summarizes the characteristics of hydraulic dual wheel groove milling machine and mainly analyzes the application points in un-derground diaphragm wall engineering from multiple aspects such as groove section division,guide wall construc-tion,mud preparation,reinforcement cage construction,diaphragm wall pouring,and groove milling construction,providing reference for related engineering construction.