The present invention discloses an all disassembleable electric-heating apparatus comprising a shell, a cover, a reservoir installed inside said shell, an electric heater installed inside said reservoir and immersed in the liquid contents of said reservoir in working mode, and control elements including a control box and thermo-elements; wherein, said thermo-elements include electrical elements, said electrical elements are peripherically electric-insulated and sealed, so as to be immersed in the liquid contents of said reservoir in working mode and be taken out for cleaning after use.