Reverse electrodialysis device using precipitation reaction, and drug injection device using same

A drug injection device comprising:

• a reverse electrodialysis device generating current through a precipitation reaction between first water-soluble solid salt and second water-soluble solid salt;
• and
• a material injection unit including a material having a charge or polarity and configured to inject the material having a charge or polarity into a skin by current generated by the reverse electrodialysis device,
• wherein the reverse electrodialysis device comprises:
• a first cell stack in which a plurality of solid salt chambers and a plurality of precipitation chambers are alternately formed and a plurality of cation-exchange membranes and a plurality of anion-exchange membranes are alternately formed, each solid salt chamber and each precipitation chamber formed through a cation-exchange membrane and an anion-exchange membrane;
• first water-soluble solid salt and second water-soluble solid salt alternately filling the solid salt chambers, and
• wherein, when the water is supplied, cations of the first water-soluble solid salt and anions of the second water-soluble solid salt are precipitated together in a precipitation chamber and anions of the first water-soluble solid salt and cations of the second water-soluble solid salt are precipitated together in a neighboring precipitation chamber.