NOVELTY - Flexible dye-sensitized solar cell comprises: a first electrode; a second electrode facing to the first electrode; and electrolyte and dye sensitizing agent between the first electrode and the second electrode.    USE - The flexible dye-sensitized solar cell is useful for industrial and commercial applications.    ADVANTAGE - By using the Ni-W substrate as the work electrode, it realizes flexible design of the flexible dye-sensitized solar cell. Meanwhile, a blocked layer is deposited on the Ni-W substrate; optical-electrical conversion efficiency of the flexible dye-sensitized solar cell is effectively improved.    DETAILED DESCRIPTION - Flexible dye-sensitized solar cell comprises: a first electrode; a second electrode facing to the first electrode; and electrolyte and dye sensitizing agent between the first electrode and the second electrode; where the first electrode is composed of a polyethylene terephtalate (PET) having transparent conductive film and a platinum electrode layer formed on the transparent conductive film of the PET; the second electrode is composed of a Ni-W substrate, a conductive layer formed on the Ni-W substrate and facing to one side of the first electrode, a blocked layer formed between the Ni-W substrate and the conductive layer and a nano-porous layer formed on the conductive layer and opposite to the blocked layer. An INDEPENDENT CLAIM is a method for preparing flexible dye-sensitized solar cell comprising: (a) preparation of the blocked layer; selecting yttrium and cerium metal powder whose weight percentage purity is above 99.999% as raw material; mixing according to different atom numbers of yttrium and cerium; by splitting and embedding, preparing metal target material having a region component property; performing ultrasonic cleaning of the Ni-W substrate through acetone solution and alcohol solution in turn; fixing cleaned Ni-W substrate on a direct current reaction sputtering cavity body; cleaning gas path of the direct current reaction sputtering cavity body; vacuuming the direct current reaction sputtering cavity body until back bottom vacuum degree is 10-5 Pa or below; introducing mixed gas in a volume ratio of Ar to H2 of 19 to 1; where volume percentage purity of argon and hydrogen is above 99.999%; until the pressure in the direct current reaction sputtering cavity body is 1-10 Pa; increasing temperature of the direct current reaction sputtering cavity body to 600-900 degrees C; opening the direct sputtering power supply to pre-sputter; adjusting the power to 50-250 W to pre-sputter for 20-120 minutes; turning on a vapor path; adjusting water pressure to 5x10-3-5asterisk10-2 Pa; sputtering; finally, obtaining a blocked layer; (b) preparation of the conductive layer; fixing the Ni-W substrate having the blocked layer in the direct current reaction sputtering cavity body; cleaning gas path of the direct current reaction sputtering cavity body; vacuuming the direct current reaction sputtering cavity body until back bottom vacuum degree is 10-5 Pa or below; introducing mixed gas in a volume ratio of Ar to O2 of 30 to 1; where volume percentage purity of argon and hydrogen is above 99.999%; until the pressure in the direct current reaction sputtering cavity body is 1-10 Pa; increasing temperature of the direct current reaction sputtering cavity body to 180-360 degrees C; opening the direct sputtering power supply to pre-sputter; adjusting the power to 50-250 W to pre-sputter for 20-120 minutes; (c) preparation of the nano-porous layer; after printing the Ni-W substrate having the conductive layer by using titanium dioxide semiconductor oxide slurry through a screen printer for 3-4 times, sintering at 490-510 degrees C to form a nano-porous layer; and (d) packaging of the flexible dye-sensitized solar cell; immersing the second electrode having the nano-porous layer in the solution including the dye sensitizing agent for 8-24 hours; taking out the second electrode from the solution including dye sensitizing agent 14; cleaning through absolute ethyl alcohol; packing the first electrode and the second electrode into an integral body through a thermal sealing film; injecting electrolyte to a closed space formed by the first electrode, the second electrode and the thermal sealing film; then, preparing the flexible dye-sensitized solar cell.