NOVELTY - Single-component alcohol sealant comprises e.g. 10-100 parts by weight (pbw) of polysiloxane base polymer, 0.1-50 pbw of alpha , omega -alkoxy polydimethylsiloxane plasticizer, 0-500 pbw of heat conduction padding, 0-300 pbw of inflaming-retarding padding, 0.1-500 pbw of reinforcing padding, 0.5-10 pbw of silane crosslinking agent, 0.5-10 pbw of silane tackifier, 0-10 pbw of platinum or platinum complex and 0.001-15 pbw of a catalyst.    USE - The single-component alcohol sealant is useful in photovoltaic module.    ADVANTAGE - The single-component alcohol sealant has rapid solidification speed and improved water absorption.    DETAILED DESCRIPTION - Single-component alcohol sealant comprises 10-100 parts by weight (pbw) of polysiloxane base polymer, 0.1-50 pbw of alpha , omega -alkoxy polydimethylsiloxane plasticizer, 0-500 pbw of heat conduction padding, 0-300 pbw of inflaming-retarding padding, 0.1-500 pbw of reinforcing padding, 0.5-10 pbw of silane crosslinking agent, 0.5-10 pbw of silane tackifier, 0-10 pbw of platinum or platinum complex and 0.001-15 pbw of a catalyst, where the polysiloxane base polymer comprises alpha , omega -dihydroxy polydimethylsiloxane, alpha , omega -trimethyl oxygen silica blocking polydimethylsiloxane, alpha , omega -glycidyl ether propyl dimethoxy blocking polydimethylsiloxane, alpha , omega -dimethoxy diethyoxyl silica blocking polydimethylsiloxane, alpha , omega -vinyl dimethoxy silica blocking polydimethylsiloxane and vinyl diethyoxyl silica blocking polydimethylsiloxane, alpha , omega -tri-methyl oxygen silica blocking polydimethylsiloxane, alpha , omega -glycidyl ether propyl dimethoxy blocking polydimethylsiloxane, alpha , omega -dimethoxy diethyoxyl silica blocking polydimethylsiloxane, alpha , omega -vinyl dimethoxy silica blocking polydimethylsiloxane and vinyl diethyoxyl silica blocking polydimethylsiloxane, the polysiloxane base polymer is prepared by blocking modification of alpha , omega -dihydroxy polydimethylsiloxane, the alpha , omega -alkoxy polydimethylsiloxane plasticizer has a structure of formula ((R2)y-O-Si(-(R1)3-y)-O-(Si(-CH3)2-O-Si(-CH3)2-O)n-Si(-(R1)3-y)-O-(R2)y), the polysiloxane base polymer has a viscosity of 10-20000 MPa, the heat-conduction padding is zinc oxide, aluminum oxide, aluminum nitride, aluminum carbide, boron nitride, silicon nitride, silicon carbide or their surface processing products, the inflaming-retarding padding is aluminum hydroxide, magnesium hydroxide, zinc borate or melamine cyanuric acid, the reinforcing padding is calcium carbonate, silicone resin, white carbon black, silica micro powder, mica powder, bentonite or talcum powder, the silane crosslinking agent is methyl dimethoxy silane, ethyl dimethoxy silane, dilute dimethoxy silane, methyl diethyoxyl silane, tetraethoxysilane, poly-ethyl silicate or metasilicic acid propyl ester, the tackifier is gamma aminopropyl trimethoxy silane, etanormal-butyl- gamma -aminopropyl trimethoxy silane, di(dimethoxy propyl) ammonia, gamma -aminopropyl diethyoxyl silane, gamma -(2,3-epoxy propyl)propyl dimethoxy silane, N- beta -aminopropyl dimethoxy silane, chlorine dimethoxy silane, propyl dimethoxy silane or propyl diethyoxyl silane, the platinum or platinum complex is platinum black, chlorine molybdic acid, chlorine molybdic acid-vinyl siloxane complex or chlorine molybdic acid-paraffin wax complex, and the catalyst is titanium isopropoxide, metatitanic acid butyl succinate, ethyl acetoacetate chelate of titanium isopropoxide, diacetone chelate of titanium isopropoxide, dibutyl dilauric acid tin or stannous octoate.