The invention discloses an electric dehydration device for preventing insulation assemblies from adsorbing impurities. The problem that a dehydration electrode insulation assembly in an existing electric dehydration device is prone to scaling, and thus breakdown occurs due to electric discharge is solved. The electric dehydration device specifically comprises an electric dehydration tank; a plurality of through holes are formed in the top of the electric hydration tank; hanging assemblies are arranged above the through holes; liquid non-flow regions are formed in the hanging assemblies and onthe lower parts of the hanging assemblies; a dehydration electrode is hung in the electric dehydration tank through the hanging assemblies; and the insulation assemblies of the dehydration electrode are located in the liquid non-flow regions. Attachment of the impurities to the insulation assemblies on the dehydration electrode can be effectively prevented, occurrence of the phenomenon that the insulation assemblies are in breakdown because an electric filed discharges along the outer walls of the insulation assemblies is avoided, the life of the dehydration electrode is prolonged, and stableoperation of the system is ensured.