The invention provides a dowel bar with a combined structure for cement concrete pavements. The dowel bar consists of a steel dowel bar, a glass steel sleeve tube and polyethylene films, wherein the inner wall of the glass steel sleeve tube is smooth, the outer surface consists of two parts, rib-shaped threads are formed in one side and firmly connected with the edge of a cement concrete plate, and the outer surface of the other side is smooth, so that the dowel bar can freely extend in adjacent grooves of the cement concrete plate. Threads are formed in one end of the steel dowel bar, one end of the steel dowel bar is tightly connected with the edge of the cement concrete plate, the outer surfaces of the other parts are smooth, the surfaces are painted and wrapped with the polyethylene films, and the bar end extends into the grooves in the edge of the cement concrete plate and can freely extend in the grooves of the cement concrete plate. The dowel bar with the combined structure has the advantages of good shearing resisting property and good corrosion resistance; besides, the stress of the contact surface with the cement concrete is uniform, the failure of the dowel bar caused by the breaking because of the cracking of the edge of the cement concrete plate is avoided, and prolonging the service life of the cement concrete pavements is benefited.