NOVELTY - Silicone sealant comprises component A and component B. The component A with viscosity of 5000-50000 cps, comprises 100 pts. wt. alpha , omega -dihydroxy polydimethylsiloxane, 3-20 pts. wt. plasticizer, and 50-150 pts. wt. filler. The component B comprises 100 pts. wt. dispersing medium, 10-45 pts. wt. filler, 20-50 pts. wt. crosslinking agent, 5-40 pts. wt. silane coupling agent, and 0.5-2 pts. wt. catalyst. The weight ratio of component A and B is 100:10-20.    USE - Silicone sealant used for solar component.    ADVANTAGE - The sealant has high strength at normal temperature, double aging at 85 degrees C for 1000 hours, and strength retention rate reaches more than 80%.    DETAILED DESCRIPTION - Silicone sealant comprises component A and component B. The component A with viscosity of 5000-50000 cps, comprises 100 pts. wt. alpha , omega -hydroxyl-terminated polydimethylsiloxane, 3-20 pts. wt. plasticizer, and 50-150 pts. wt. filler. The component B comprises 100 pts. wt. dispersing medium, 10-45 pts. wt. filler, 20-50 pts. wt. crosslinking agent, 5-40 pts. wt. silane coupling agent, and 0.5-2 pts. wt. catalyst. The weight ratio of component A and B is 100:10-20. The plasticizer is silicone oil with viscosity of 200-l000 cps. The dispersion medium is methyl silicone oil, MDT silicone oil, vinyl silicone oil, silyl-terminated polyether, and/or MQ resin. The crosslinking agent is tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, methyl dimethoxysilane, methyl diethoxy silane, dimethyl diethoxysilane, dimethyl dimethoxysilane, dimethylsilane, ethyltrimethoxysilane, ethyltriethoxysilane, vinyltrimethoxysilane, and/or vinyltriethoxy silane. The catalyst is dibutyl tin dilaurate, dioctyl dilaurate, and/or dibutyl tin diacetate. An INDEPENDENT CLAIM is included for preparing double component silicone sealant comprising:    (A) adding alpha , omega -hydroxy polydimethylsiloxane, plasticizer, and filler into stirring kettle, controlling stirring speed at 500-2000 revolutions per minute (rpm), temperature at 50-150 degrees C, vacuum degree at 0.09-0.10 MPa, stirring for 1.5-3 hours, and cooling to obtain component A;    (B) adding dispersion medium, filler, crosslinking agent, silane coupling agent, catalyst, and water to stirring kettle, controlling stirring speed at 500-2000 rpm, temperature is not higher than 50 degrees C, vacuum degree is 0.09-0.10 MPa, stirring for 0.5-2 hours, cooling to obtain component B; and    (C) adding components A and B in static mixer, mixing uniformly, and aging.