The invention provides a double-face printer. The double-face printer comprises a machine frame, a cloth unwinding roller, a cloth winding roller, a first printing platform, a visual identity device, a second printing platform and a control cabinet, wherein the cloth unwinding roller and the cloth winding roller are installed on the same side of the machine frame; the first printing platform and the second printing platform are arranged in the same direction; the first printing platform is used for printing position coordinate images and target patterns on the first face of a printing material passing through the first printing platform, and the second printing platform is used for printing position coordinate images and target patterns on the second face of the printing material passing through the second printing platform; the visual identify device is arranged on the front side of the cloth feeding end of the second printing platform and used for detecting the position coordinate images, obtaining the coordinate offset and sending the coordinate offset to the control cabinet; and the control cabinet is arranged in the machine frame and used for adjusting the initial printing position of the second printing platform according to the coordinate offset, so that the second face of the printing material passing through the second printing platform is printed. Through the double-face printer, the alignment precision of double-face printing can be ensured.