NOVELTY - A monocomponent silicone sealant for solar battery modules comprises (pts.wt.) alpha , omega -dihydroxyl dimethyl siloxane (100), petroleum resin (1-5), active calcium carbonate (10-40), microsilica (30-70), gas phase white carbon black (1-5), crosslinking agent (10-17), silicane coupling (1-3.5), catalyst (0.5-1.5), and silicone oil plasticizer (1-10).    USE - The monocomponent silicone sealant is used for solar battery modules (claimed).    ADVANTAGE - The monocomponent silicone sealant for solar battery modules has excellent weather tolerance, anti-yellowing performance, lower vapor permeation rate, and excellent storing stability.    DETAILED DESCRIPTION - A monocomponent silicone sealant for solar battery modules comprises (pts.wt.) alpha , omega -dihydroxyl dimethyl siloxane (100), petroleum resin (1-5), active calcium carbonate (10-40), microsilica (30-70), gas phase white carbon black (1-5), crosslinking agent (10-17), silicane coupling (1-3.5), catalyst (0.5-1.5), and silicone oil plasticizer (1-10); where alpha , omega -dihydroxyl dimethyl siloxane is of Formula 1:    n=100-2000.    An INDEPENDENT CLAIM is a method for preparing the monocomponent silicone sealant for solar battery modules comprising: (1) drying and dehydrating gas phase white carbon black having a specific surface area of 150-200 cm3/g for 1.5-2.5 hours at 115-125 degrees C; (2) preparing the monocomponent silicone sealant for solar battery modules: adding (pts.wt.) alpha , omega -dihydroxyl dimethyl siloxane (100), petroleum resin (1-5), active calcium carbonate (10-40) and microsilica (30-70) to a vacuum kneading machine; dehydrating for 30-200 minutes at 100-150 degrees C and 0.06-0.099 MPa; cooling to obtain base material; adding (pts.wt.) gas phase white carbon black (1-5), crosslinking agent (10-17), silicane coupling (1-3.5), catalyst (0.5-1.5) and silicone oil plasticizer (1-10) to a high speed dispensator filled with base material at room temperature; and stirring for 30-150 minutes with a vacuum degree of 0.06-0.099 MPa and a rotation speed of 200-600 rotations per minute (rpm) to obtain monocomponent silicone sealant.