The invention relates to a double-sided enlarging print device. The device comprises a printing paper feeding mechanism, an exposure platform, an exposer, a printing paper conveying mechanism, a turn-over mechanism and a selecting mechanism, wherein the printing paper feeding mechanism feeds the printing paper for exposure; the exposure platform is arranged behind the printing paper feeding mechanism to accommodate the printing paper for exposure; the printing paper conveying mechanism is provided with a conveying belt going around the exposure platform to convey the printing paper to the exposure platform; the exposer projects light beams to expose the toward-the-light face of the printing paper on the exposure platform; the turn-over mechanism turns over the printing paper entering the turn-over mechanism and then conveys the turned-over printing paper to the exposure platform so as to make the unexposed face of the printing paper the toward-the-light face; and the selecting mechanism is arranged between the exposure platform and the turn-over mechanism and used for selecting the printing paper to enter the turn-over mechanism or be directly outputted. The double-sided enlargingprint device only needs one exposer, and can fully utilize the original single-side enlarging print equipment.