Abstract: In recent years, hydrogel-based conductive materials as flexible wearable devices have attracted wide attention. Flexible wearable devices can not only be used to collect physiological signals of human body for remote health monitoring, but also show great application potential in man-machine interface, soft robot and other aspects. Conductive hydrogels with good electrical conductivity, high extensibility, adjustable flexibility, biocompatibility and multiple stimulus response become an ideal material for flexible wearable devices. Up to now, various conductive materials have been widely used to prepare conductive hydrogels. In this paper, conductive composite hydrogels are classified according to conductive materials, including ionic conductive hydrogels (based on salt ions, ionic liquids, polyelectrolytes) and electronic conductive hydrogels (based on conductive polymers, carbon materials, MXene and metal), and then introduce the application progress of conductive hydrogels in flexible wearable devices such as human movement monitoring, health monitoring and human-machine interface.