The invention discloses a slope stability analysis technology under a complicated condition and a half-gravity type reinforced retaining wall, and a slope stability analysis system under a complicated condition and a concrete half-gravity type reinforced retaining wall are included. The slope stability analysis system under the complicated condition comprises three modules which are a front processor, a solver, a back processor. The half-gravity type reinforced retaining wall comprises a toe plate and a heel plate which are horizontally arranged in parallel, a vertically arranged vertical wall whose lower end is connected between the toe plate and the heel plate, steel bars configured in the toe plate, the heel plate and the vertical wall, and bar belts which are horizontally arranged in multi layers which are separately arranged on the vertical wall, wherein one end of each bar belt is connected with the back side of the vertical wall. The invention provides a visual auxiliary decision platform to the government, the quality of the engineering construction can be improved, geological disasters such as landslide can be better prevented and controlled, and the slope stability analysis technology under the complicated condition and the half-gravity type reinforced retaining wall can play a demonstration role in slope stability analysis and protection.