The present invention relates to a liquid leakage sensing device that is capable of dividedly detecting water and chemical solutions in sensing liquid leakage using electrolysis, determining the kind of the leaking liquid detected, and being reused, not disposable. According to the present invention, the liquid leakage sensing device includes: a liquid leakage sensor (10) having a first electrode (11) and a second electrode (12) made of a conductive metal in such a manner as to be facedly spaced apart from each other by a given distance; a voltage/current amplifier (20) adapted to vary a voltage and a current to apply the varied voltage and current to the liquid leakage sensor (10); a current sensor (30) adapted to detect a value of current flowing between the electrodes of the liquid leakage sensor (10); and a controller (40) adapted to controlledly output a voltage applied between the first electrode (11) and the second electrode (12) of the liquid leakage sensor (10).