The invention discloses a fiber feeder used in automatic fiber coiler, composed of a fiber collector, a driver, a transmit box, a fiber discharge wheel, a support base, and a sliding table, wherein the support base is mounted on the sliding table, while the upper end is mounted with the transmit box, the driver is on the transmit box, while a motor and a speed reducer are mounted at the outer back of the transmit box, the accurate shaft of the driver is suspended at the outer front of the transmit box, which is mounted with the fiber discharge wheel, the fiber collector is at one side of the support base, vertically with the fiber discharge wheel. The invention can feed fiber in various automatic fiber coilers, and in the machine as fiber repeat coiler and fiber selector. The invention uses the accurate suspended shaft to vertically support the fiber discharge wheel to discharge fiber, and arranges the fiber collector under the wheel to collect the fiber output by the wheel into a fixed point to be moved out, thereby confirming the feeding direction consistence of the tension wheel and confirming the tension consistence in the fiber coiling process.