The invention discloses a lithium titanate-base hybrid supercapacitor and a preparation method thereof. The lithium titanate-base hybrid supercapacitor is composed of a positive electrode, a negative electrode, a diaphragm located between the position electrode and the negative electrode and an organic electrolyte. According to the positive electrode, a double-electrode-layer energy storage material is adopted as active matter and mixed with a conductive agent and a binding agent, and the mixture is spread on a current collector. According to the negative electrode, a mixture of Li4Ti5O12 and Li7Ti5O12 is adopted and mixed with a conductive agent and a binding agent, and the mixture is spread on the current collector. The electrolyte is prepared from a solute and a solvent, CH3CN serves as the solvent, and LiPF6 serves as the solute. Compared with a double-electrode-layer supercapacitor, the prepared hybrid supercapacitor has higher energy density and the same high power density and can be widely applied to the fields of hybrid electric vehicles, golf carts, motor-start buses or pure-electric buses, tramcars and the like, wherein the energy density can reach 5-25 Wh/Kg, and the high power density is higher than 12000 W/Kg.