This article deals with the feasibility of using recycled corrugated paper board (rPF) as the reinforcing material for recycled plastics. The composites of recycled polypropylene (rPP) and rPF were prepared by extrusion compounding and injection molding, and the rPP/rPF composites compatibilized by maleic anhydride grafted PP (PP-g-MA), maleic anhydride grafted ethylene-1-octene copolymer (POE-g-MA), and maleic anhydride grafted styrene-ethylene-butylene-styrene copolymer (SEBS-g-MA) were also prepared. The crystallization and melting behavior, mechanical properties, thermal stability, and morphology of these composites were studied. The results indicated that rPF promoted the crystallization, enhanced the strength and toughness of rPP/rPF composites to some extent while decreased thermal stability at the same time. PP-g-MA and POE-g-MA improved the dispersion and interface adhesion of rPF, and further upgraded the mechanical properties and vicat softening temperatures. Among these compatibilizers, PP-g-MA was most favorable to the strength improvement while POE-g-MA was most favorable to the toughness improvement. As for SEBS-gMA, it had no obvious modification effect. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 122: 2789-2797, 2011