The utility model relates to a vacuum distillation tower for purifying dichloroethane, comprising a cylinder body, a material inlet, a heat medium inlet, a heating coil, a material outlet, a heat medium outlet, a grate plate, packing, a foam eliminator, a gas phase outlet and the like. With the adoption of the vacuum distillation tower for purifying the dichloroethane, the problem that safety accidents are caused by the unsafe factors existing in the traditional distillation equipment for purifying the dichloroethane is solved. The vacuum distillation tower for purifying the dichloroethane has the advantages of reasonable structure, convenience in operation and little investment, can be widely applied to processes for purifying the dichloroethane, and is particularly suitable for processes for purifying the dichloroethane from chlorethylene rectified residues in processes for producing polyvinyl chloride with a calcium carbide process.