Rectangular anti-slide pile is widely used in geotechnical engineering construction design because of its special property of optimal bending moment resistance. Conventional rectangular anti-slide pile excavation can only be carried out by manual excavation， which has low efficiency， long period and great safety risks. In the practice of recovery and control engineering of Sanxing Dishui Rock landslide section， the author adopted rotary drilling machine to assist excavation， which greatly improved the excavation efficiency and shortened the manual underground operation cycle， reduced the hidden danger and risk， and provided a good reference value for the safe and efficient construction of similar projects in the future.