The invention discloses a friction hinge reinforcing connecting fitting. The fitting comprises a friction hinge, wherein the friction hinge comprises a sliding rail and a wrap angle, the sliding railcomprises an rail first end and a rail second end which are opposite, the fitting further comprises an L-shaped clamping seat, a pressing seat and a fixing piece, wherein a short arm of the L-shaped clamping seat is arranged on the wrap angle, a concave surface platform with the same width as the sliding rail is arranged on the bottom surface of the short arm, the concave surface platform is internally provided with a groove matched with the shape of the wrap angle, a long arm of the L-shaped clamping seat is attached to the side wall of a window outer frame, a hook is arranged on one side ofthe long arm, and a penetrating hole is formed in the long arm of the L-shaped clamping seat; one side of the pressing seat is provided with a protruding piece, the protruding piece is pressed on therail second end, a hook is further arranged on the pressing seat, and a penetrating hole is formed in the pressing seat; and the fixing piece is arranged between the L-shaped clamping seat or the pressing seat and the window outer frame, a penetrating hole is formed in the fixing piece, and the fixing piece is fixedly connected with the L-shaped clamping seat or the pressing seat through a fastener. The friction hinge reinforcing connecting fitting is reasonable in structural design, simple and convenient in installation mode, simple in fitting production and processing technology, and capableof enhancing the safety of a top-hung window.