The invention relates to a silicone sealant with finishing capacity and a preparation method of the silicone sealant. The silicone sealant with finishing capacity comprises raw materials in parts by weight as follows: 100 parts of alpha-omega-dyhydroxyl polydimethylsiloxane, 20-60 parts of modified polysiloxane, 0-10 parts of a plasticizer, 120-200 parts of calcium carbonate, 4-8 parts of a crosslinking agent, 0.2-1 part of a coupling reagent and 0.02-0.5 part of a catalyst. Fatty acid substances with high surface energy are introduced into a system through grafting, so that the surface energy of the silicone sealant after curing is improved, and the introduced fatty acid substances cannot be separated out due to incompatibility with the system, so that influence on the bonding performance of the silicone sealant is avoided.