To provide a two-liquid reactive polyurethane resin composition excellent in compatibility and storage stability of a main agent component and to provide a two-liquid reactive polyurethane resin composition giving a polyurethane resin excellent in water resistance and mechanical characteristics.

The two-liquid reactive polyurethane resin composition comprises a main agent (A) and a curing agent (B). The main agent (A) contains a urethane prepolymer obtained by reacting (a) a castor oil polyol, (b) an aromatic monoamine polyol and (c) an organic isocyanate compound selected from a group consisting of diphenylmethane diisocyanate, polymethylene polyphenyl polyisocyanate and their carbodiimide denaturated compounds. The curing agent (B) contains (d) a castor oil polyol, (e) polytetramethylene ether glycol, (f) an amine polyol and (g) a polyamine.