The invention discloses a single-side machine with an accurate synchronous transferring device. The single-side machine comprises a stand (1), a feed roller (2) and a slow conveying belt (3), wherein the slow conveying belt (3) is mounted on the stand (1); a coder (4) is mounted on a roller shaft of the feed roller (2) of the single-side machine; a low speed measuring wheel (5) and a high speed measuring wheel (6) are respectively mounted on the stand (1) through a mounting support; the axle of the low speed measuring wheel (5) and the axle of the high speed measuring wheel (6) are located below the slow conveying belt (3); in a normal working state, a paperboard wrinkly paper head (8) always swings back and forth on the high speed measuring wheel (6); the low speed measuring wheel (5) isalways located on the paperboard wrinkly paper section; and a length generator (7) is mounted on the stand (1) and located at the front end of the slow conveying belt (3). The single-side machine disclosed by the invention has the advantages of simple and compact structure and high precision, and can effectively ensure the coordinated operation of the entire production line.