An electrospinning device includes a rotatable carrier, a collector unit including at least one collector bar, a dispenser for dispensing a polymer composition, and a power supply. The collector bar is disposed on the rotatable carrier and is rotatable about a longitudinal axis. The power supply is configured to produce a potential difference between the dispenser and the collector bar so as to permit the polymer composition to erupt from the dispenser as a jet of the polymer composition toward the collector bar to thereby permit the resultant electrospun fibers to be collected on the collector bar. By rotating the rotatable carrier at a relatively fast speed, the electrospun fibers are drawn to be arranged along the longitudinal axis.