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This invention belongs to the field of thermoelectric materials technology, specifically disclosing an ion thermoelectric gel device, its preparation method, and its application. The ion thermoelectric gel device includes at least one device; the device includes a first electrode, an ion thermoelectric gel unit, and a second electrode arranged in series; the first electrode and / or the second electrode includes a substrate layer and a conductive layer stacked together; the substrate layer is made of an elastic polymer material; the conductive layer is made of conductive particles and conductive nanowires; the conductive particles coat the surface of the conductive nanowires, and the materials of the conductive particles and the conductive nanowires are each independently selected from at least one of gold, silver, platinum, and copper. This device exhibits excellent ion thermoelectric potential and high normalized power density, effectively solving the long-standing core bottleneck of insufficient output power in this field.