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method for producing symmetric alkoxy (organo) disiloxanes of the general formula [RR(AlkO)Si]O from alkoxysilanes of the general formula RRSi(AlkO), where Ris CH, CH, CH=CH, CH; Ris CH, CH; Alk is C-Calkyl; a is equal to 0 or 1; b is equal to 0 or 1, comprising sequentially reacting the said alkoxysilane with sodium hydroxide and carbon dioxide.EFFECT: increasing the yield of the desired products, does not require the use of catalyst and solvents, can be carried out in a single reactor without isolation of the intermediate product.4 cl, 1 tbl, 20 ex