Preparation method for manganese dioxide/carbon composite materials used for super capacitor

The invention relates to a preparation method for manganese dioxide/carbon composite materials used for a super capacitor. The preparation method is characterized in that carbon materials are added into ionized water, and ultrasonic dispersion is used for preparing carbon material dispersion liquid; bivalent manganese salt and potassium permanganate are fed into the dispersion liquid and are stirred to sufficiently dissolved; the mixing solution is transferred into a water heat reactor, black sediment is obtained after water heat reaction for a period, and the manganese dioxide/carbon composite materials can be obtained after washing and drying. The preparation method improves the utilization rate of manganese dioxide electrode materials. The electrode materials can be used for preparing a super capacitor with high specific capacity, high energy density and high power density.