The invention discloses a portable small-tension
yarn winding machine for a large-core-number high-density micro-cluster optical cable, wherein the
machine comprises a rack, a motor, a supporting sleeve, a central hollow
pipe, a first bearing, a movable ring mold seat, a
yarn drum shaft sleeve, a guide mold, a
flying shuttle and a
yarn guide
pipe; the central hollow
pipe is rotatably mounted on the inner side of the supporting sleeve through the first bearing; the motor is connected with the first end of the central hollow pipe through a transmission mechanism, the movable ring mold seat is mounted at the second end of the central hollow pipe, and the guide mold is mounted on the movable ring mold seat; the yarn drum shaft sleeve is rotatably mounted on the outer side of the supporting sleeve through a second bearing; the
flying shuttle is fixedly mounted on the movable ring mold seat; and the yarn
guide tube is fixedly arranged on the
flying shuttle. The rotating resistance torque of the second bearing can be converted into the product of yarn winding tension and the force arm from the outer
diameter of a yarn roll to the central hollow pipe, the maximum yarn winding tension is small, the maximum value and the minimum value of the yarn winding force value are controllable, control is safe, the situation that a micro-cluster pipe or an
optical fiber is damaged by tying cannot occur, and the yarn
winding machine is reliable.