The present invention relates to a composition for a three component lime mortar comprising natural hydraulic lime (NHL) powder, blast furnace slag (BFS) powder, and limestone fine powder (LP). The three-component lime mortar composition of the present invention has remarkably improved physical properties of compressive strength and cohesion property by the addition of blast furnace slag and limestone fine powder, and since the natural hydraulic lime is included as the main raw material, Environment-friendly properties such as moisture resistance, antifungal activity. The composition for lime mortar of the present invention can be used as eco-friendly interior and exterior materials, finishing materials, bonding materials and the like of buildings.
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