This invention refers to an addition-type organosilicon sealant for halogen-free conductive and flame-resistant electric products, which consists of: A) vinyl silicone oil; B) silicon dioxide treated by silane or aluminum oxide treated by silane; C) a compound in which every molecule contains H—Si functional group, the mass content of H is 0.1-1.2%; D) hydrolysis product from hydrolysis reaction between Vinyl trimethoxy(triethoxy) silane and γ-(2,3-epoxy propoxy) propyl trimethoxy(triethoxy) silane; E) chloroplatinic acid or 1,3-divinyl-1,1,3,3-tetramethyl disiloxane platinum complex; F) any one or combination of carbon black, iron black, titanium dioxide, cerium oxide, benzotriazole, zinc carbonate and magnesium carbonate. The substance provided by this invention, which is halogen-free and flame-resistant with certain heat conductivity and viscosity, is quite applicable to sealing of electric products.