A voice coil motor (VCM) actuator includes a fixed bracket, a lens barrel, two flat spring plates, a support plate, a plurality of positioning pins, a plurality of coils, and a plurality of magnets. The fixed bracket includes a first chamber and a plurality of magnet mounting holes. A lens barrel is positioned in the first chamber. The flat spring plates and the support plate include a plurality of first locating holes and second locating holes. Two resilient heads are formed on two ends of each positioning pin. Each positioning pin interconnects between respective first locating holes of the flat spring plates and respective second locating holes of the support plate. A plurality of coils are wrapped around an outer wall of the lens barrel. A plurality of magnets is received in the magnet mounting holes.