The invention discloses a connecting member of a compound wall body, which consists of a FRP ( Fiber Reinforce Plastic) plug board, FRP plug ribs and an ABS (Acrylonitrile Butadiene StyreneAcrylonitrile) plastic lantern ring, wherein a lower end part of the FRP plug board is in a shape of a wedge angle, symmetric and opposite vertical grooves are arranged on the two sides of the FRP plug board, and convex ribs are arranged on the two sides of the vertical grooves; at least two FRP plug ribs are respectively inserted in the vertical grooves on the upper section and the lower section of the FRP plug board; and the ABS plastic lantern ring is sleeved in the middle section of the FRP plug board and consists of a lantern ring and a lantern ring cap arranged on the upper end part of the lantern ring body; an inner side wall of the lantern ring body corresponds to the shape of the cross section of the FRP plug board, and an outer side wall of the lantern ring body is a rough surface. The connecting member is suitable for prefab insulating wall bodies with integrated structural function, has the advantages of excellent anchoring performance, low heat conduction coefficient, favorable corrosion resistance, simple and convenient construction and the like, and has a wider application prospect in the field of civil engineering.