The invention discloses a sound-insulation and heat-insulation hollow-glass spacing bar. The sound-insulation and heat-insulation hollow-glass spacing bar is prepared from, by weight, 14-18 parts of polydimethylsiloxane, 5-10 parts of hexamethyldisiloxane, 4-9 parts of ring methyl siloxane, 4-9 parts of vinyltriethoxysilane, 4-7 parts of sodium acrylate, 3-6 parts of butyl nitrite, 2-7 parts of ethyl chloroformate, 5-11 parts of white carbon black, 4-6 parts of isoamyl chloride, 5-7 parts of 3-hydroxy-2-butanone, 2-3 parts of sodium hydrogen sulfite, 4-8 parts of maleic anhydride, 1-3 parts of benzoyl chloride, 2-3 parts of copper chloride, 1-4 parts of sulfamic acid, 3-5 parts of sodium ethoxide, 5-8 parts of a crosslinking agent and 4-6 parts of a thickening agent. The sound-insulation and heat-insulation hollow-glass spacing bar is good in sound insulation and heat insulation. In addition, the invention further discloses a relevant preparation method.