The invention provides a preparation method of a silicon anode lithium-ion battery employing a carbon nanotube paper as a current collector. In the preparation method, an anode battery case (1), an anode plate (2), a membrane (3), a cathode plate (4), foamed nickel (5) and a cathode battery case (6) are involved; the carbon nanotube paper of the anode plate (2) is coated with silicon powder; aluminum foil of the cathode plate (4) is coated with a cathode active material; the aluminum foil is adopted by the cathode current collector; the surface is dried after being coated with the cathode active material, and is cut to obtain the cathode plate according to the size of a battery; the anode takes the carbon nanotube paper as the current collector; the surface is dried after being coated with anode slurry, and is cut into the size equal to that of the cathode plate to obtain the anode plate; vacuum drying is carried out; and finally, an electrolyte is added to a vacuum glove box to assemble the battery according to the order of the anode shell, the anode plate, the membrane, the cathode plate, the foamed nickel and the cathode case. Compared with a copper foil current collector, the battery provided by the invention has obvious advantages; and the discharge capacity of the silicon anode lithium-ion battery employing the carbon nanotube paper as the current collector is improved by over 100%-500% in comparison with that of a traditional copper foil current collector under the same conditions.