In view of the problem that gravity retaining walls fail to meet the needs of complex site support, a new type of support structure has thus been proposed with the combined anchor wall of the double row pile supported ribbed column pile plate wall. Based on a high fill slope engineering project in Qingdao, numerical simulation software FLAC3D is used to establish numerical models for slope support of new anchor plate walls with anchor cables and rigid reinforced plates, as well as the combined anchor wall of the double row pile supported ribbed column pile plate wall, followed by a comparison and analysis of the safety and stability coefficient, retaining wall displacement, and pile sheet wall bending moment stress of the slope under two types of support structures. The data shows that the slope safety stability coefficient, top displacement of the retaining wall, and maximum bending moment of the pile plate wall supported by a new type of anchor plate wall structure using anchor cables and rigid reinforced plates are 13.6, 0.261 m and 593 kN·m, respectively. The slope safety and stability coefficient, top displacement of the retaining wall, and maximum bending moments of the pile sheet wall supported by double row piles and ribbed column pile sheet wall combined with anchor wall support structure are 13.9, 0.225 6 m and 269.3 kN·m respectively. The double row pile supported ribbed column pile plate wall combined with anchor wall support structure is characterized with a better safety and deformation resistance ability. Subsequently, a study is conducted on the design parameters of the combined anchor wall structure of the double row pile supported ribbed column pile sheet wall, and it is found that the support structure exhibits a stronger resistance to lateral deformation with the increase of the pile length and diameter.