The invention relates to the super capacitor technical field, in particular to a carbon-based super capacitor based on polyacrylamide gel electrolyte and a preparation method thereof. The carbon-based super capacitor mainly consists of a capacitor shell, and electrodes, diaphragms and electrolyte which are placed in the capacitor shell. The electrodes are carbon nanotube-carbon fiber composite material electrodes, the electrolyte is polyacrylamide gel, and the capacitor shell is made from any one of polyvinyl alcohol, polymethyl methacrylate, polycarbonate, polyvinyl chloride, polyethylene, polypropylene or polystyrene. Compared with the prior art, the electrochemical super capacitor prepared by the method can be rapidly charged and discharged, and has the advantages of wide window voltage range, higher specific capacitance ranging from 20F/g to 50F/g and good electrochemical capacitor properties.