The invention discloses an enhanced super capacitor and a preparation method thereof, especially an electrolyte, a super capacitor based on the electrolyte and including an anthraquinone redox activesubstance, and a preparation method of the super capacitor. The electrolyte comprises a support electrolyte, the anthraquinone redox active substance and a solvent. The novel super capacitor has a higher specific capacitance compared with that of common carbon-based super capacitors, and obvious advantages in the capacitive performance compared with a super capacitor made of the same electrode material but does not include the anthraquinone redox active substance. A simple method is used, the circulation stability of the carbon-based super capacitor is improved, the capacitive performance of the carbon-based super capacitor is improved effectively, and the prepared super capacitor is characterized by high specific capacity, high energy density and high power density, and has huge application potentials.