The invention discloses a Y-axis cloth feeding mechanism, which comprises a guide rail seat and a synchronous belt. The two ends of the guide rail seat are respectively provided with a driven wheel mechanism. A driving wheel mechanism is arranged on the guide rail seat. Due to the arrangement of the driving wheel mechanism, the guide rail seat is divided into a sliding region and a growth region. The sliding region is internally provided with a pulley, and the pulley is fixedly provided with a toothed plate. The synchronous belt is sleeved on the driven wheel mechanisms at the two ends of the guide rail seat and the driving wheel mechanism on the guide rail seat to be fixed to the toothed plate. Each driven wheel mechanism further comprises an adjustment mechanism for tightening the synchronous belt. The middle section of the driving wheel mechanism, arranged on the guide rail seat, is matched with the adjustment mechanisms of the driven wheel mechanisms at the two ends of the guide rail seat. Therefore, the transfer efficiency of the Y-axis cloth feeding mechanism is improved. The Y-axis cloth feeding mechanism is simple in structure and convenient to operate. The sliding wear of the pulley on the guide rail seat is reduced, and the maneuverability is improved.