The ancient landslide body is generally in a stable state under natural conditions, but the front edge is prone to revive and deform after excavation. A certain highway in southwestern Sichuan Province passes through the front edge of the Qinggang ancient landslide body, and local revival deformation occurred after excavation. Through geological mapping, drilling, deformation monitoring, and other means, the characteristics and causes of the ancient landslide body and its revival deformation zone were investigated, and prevention and monitoring measures were implemented. The results show that the sliding soil in the front edge of the ancient landslide body is mainly composed of gravel clay and angular gravel soil, with low mechanical parameters, which is the geological condition for local revival. The excavation of the front edge and rainfall are the inducing factors for local revival. Under the premise of considering rapid and reliable construction, the pile-plate wall and counter-pressure scheme are adopted for timely and effective treatment of the landslide body, avoiding the overall revival of the ancient landslide body. The research results can provide survey and design references for the excavation disturbance of the front edge of ancient landslide bodies in subsequent highway and other engineering projects.