The invention relates to the technical field of optical fiber manufacturing, and discloses a constant-speed winding device for optical fiber manufacturing. The device comprises a driving disc, connecting plates are welded to the outer side of the driving disc, a locking disc is welded to the outer sides of the connecting plates, a device disc is rotationally connected to the front face of the driving disc, trigger mechanisms are arranged on the front face of the driving disc, and locking mechanisms are arranged on the front face of the device disc; and circle centers of the driving disc, the locking disc and the device disc are located on the same straight line. According to the constant-speed winding device for optical fiber manufacturing, through matched use of the driving disc and the trigger mechanisms, when the winding speed of an optical fiber is too high, contact blocks can be in contact with contacts, so that the locking mechanisms are started; and through matched use of driving shafts and sliding blocks, when the driving shafts rotate, the sliding blocks move, under hinging of support rods, brake blocks are pushed to be in contact with the inner side of the locking disc, so that the speed reducing effect is achieved, constant-speed winding work is guaranteed, further, the optical fiber manufacturing efficiency is improved, and economic loss caused by optical fiber breakage is avoided.