The invention discloses a preparation method of bacteriostatic water-absorbent resin. The preparation method comprises the following steps: by taking starch as a raw material, adding acrylic acid, an initiator and a crosslinking agent; preparing water-absorbent resin by virtue of a liquid polymerization method; then, adsorbing silver ions by virtue of the prepared water-absorbent resin; and drying to obtain the bacteriostatic resin. The obtained water-absorbent resin has a high water absorbent rate and excellent water-retaining and bacteria-inhibiting performances.