The invention discloses a flexible electrode, a preparation method and an application thereof. The composition of the electrode comprises, in part by weight, polyvinylidene fluoride 40-90 parts, conductive carbon material 10-30 parts, active substance 0.001-20 parts, polyethylene glycol 5-30 parts, that flexible electrode of the invention has the characteristics of foldable coil, self-conductivity, super capacitance, low cost, easy industrialization, easy fabrication into wearable equipment, recyclability, and variable capacitance size, and can be use in acid/alkali/neutral environment according to requirements.