A method for producing ketimine structure-containing alkoxysilane comprising reacting amino-functional alkoxysilane with a monocarbonyl compound by heating and azeotropically distilling off the produced water together with the monocarbonyl compound to yield ketimine structure-containing alkoxysilane, characterized by introducing additional monocarbonyl compound at the time of the azeotropic distillation of the produced water together with the monocarbonyl compound.