The present invention relates to a coil spring support for a vehicular suspension system, which comprises a base plate and a support column protruding from the base plate, wherein a coil spring is coupled to the support column in such a manner that the lower end of the coil spring is fitted in and coupled to a coupling groove, which is formed on the outer peripheral surface of the support column and at a position having a predetermined height from the base plate, so that the coil spring support can be auxiliarily installed on a plate spring of a vehicle so as to compensate and improve a shock absorbing capability of the existing vehicle.