The present invention relates to an epoxy resin adhesive used for combining, filling, or restoring stone materials and, more specifically, to an epoxy resin adhesive which contains a mixed hardener in a constant composition ratio, obtained by mixing a rapid hardener rapidly proceeding hardening to a predetermined viscosity and a low speed hardener slowly proceeding hardening to a predetermined viscosity. The epoxy resin adhesive can include a reactive diluent for minutely adjusting the viscosity of the epoxy resin adhesive, and an inorganic additive formed of materials similar to the stone materials of stone cultural heritages. An effect for properly controlling the working time of a worker to preserve and restore various stone cultural heritages is obtained by mixing the rapid hardener and the low speed hardener to obtain a hardener controlling a viscosity by hardening and hardening speed of an epoxy resin, and using the hardener with the epoxy resin which is a main material. An effect for perfectly restoring and preserving stone cultural heritages is obtained by reducing the initial viscosity of the epoxy resin adhesive which contains the main material and the hardener to add the inorganic additive.
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