An exemplary pin bending device (200) includes a base (210), a sliding member (230), a fixing member (240), and a latch member (250). The sliding member (230) is slidably positioned on the base and defines a plurality of holes (2303) for receiving first portions of pins. The fixing member is fixed on the base. The latch member is movably positioned on the base. The latch member is able to move towards the fixing member in a direction perpendicular to the sliding direction of the sliding member and engage with the fixing member to fix second portions of the pins.