The present invention relates to a sealing glass composition for an intermediate-temperature planar SOFC, and a composition herein comprises a mixture of BaO, Al2O3, B2O3 and SiO2 in a particular mixing ratio and a metal oxide such as CeO2, Fe2O3, Mn2O3 and Cr2O3, thereby enabling the SOFC to efficiently operate at an intermediate temperature. The composition for a planar SOFC satisfies thermal properties, mechanical properties and electric properties that are required as a sealing glass for an intermediate-temperature SOFC, and also prevents the mixing between fuel gas and air, thereby being useful for the commercialization of SOFCs.