the present invention provides a process for producing an acetylenediol continuously by reacting a ketone with acetylene in the presence of an alkali catalyst , which process comprises continuously feeding , into a first - stage reactor , a reaction solvent , an alkali catalyst , a ketone and acetylene to give rise to a reaction , continuously introducing the reaction mixture into a second - stage reactor , and continuously feeding a fresh portion of the same ketone into the second - stage reactor to give rise to a reaction .