Conductive hydrogels combine the characteristics of hydrogel and the unique electrical properties of conductive polymer

and have the special three-dimensional network structure. The polyaniline (PANI) has been widely used because of its unique conductive properties

therefore

PANI conductive hydrogel is one of the most widely studied conductive hydrogels. The preparation methods and development of PANI conductive hydrogels are reviewed in this paper. Four preparation methods of PANI conductive hydrogel are described in detail: direct filling

in-situ polymerization

chemical crosslinking and physical crosslinking. The traditional methods of preparing PANI conductive hydrogels are direct filling and in situ polymerization

but the obtained PANI conductive hydrogels are composed of insulating hydrogel component and conducting PANI component

and their electrochemical performance are not high. The application of chemical crosslinking method improves the electrochemical properties of PANI conductive hydrogels

while physical crosslinking method is seldom used. Finally

the applications and future directions of conductive hydrogel materials are prospected.