TECHNOLOGY FOCUS - POLYMERS - Preferred Method: Preparing the vanadium redox battery bi-polar plate comprises: boiling and soaking the flexible graphite plate for 3 hours in the methanol solution of the phenolic resin (30 mass %) and drying for 24 hours at 20-30 degrees C, after solidifying for 1 hour at 180 degrees C, the plate is pressed for 15 minutes, when the pressure is 50 MPa, the pressed flexible graphite plate is carbonized in the nitrogen atmosphere, where the carbonizing process, comprises heating the plate to 300 degrees C with the speed of 2 degrees C per minute at 5-30 degrees C and the temperature is maintained for 20 minutes, heating to 600 degrees C with the speed of 0.75 degrees C per minute and the temperature is maintained for 20 minutes, heating to 850 degrees C with the speed of 2 degrees C per minute and the temperature is maintained for 30 minutes, and after being naturally cooled to 5-30 degrees C, the plate is pressed for 15 minutes at 20 Mpa pressure to obtain the product and the weight-average molecular weight of the phenolic resin is 800g/mol; or boiling and soaking the flexible graphite plate for 4 hours in the methanol solution of the epoxy resin (10 mass %) and drying for 24 hours at 20-30 degrees C, after solidifying for 2 hours at 120 degrees C, the plate is pressed for 10 minutes when the pressure is 80 MPa, the pressed flexible graphite plate is carbonized in the nitrogen atmosphere, where the carbonizing process comprises heating the plate to 200 degrees C with the speed of 1 degrees C per minute at 5-30 degrees C and the temperature is maintained for 60 minutes, heating to 400 degrees C with the speed of 0.5 degrees C per minute and the temperature is maintained for 90 minutes, heating to 1000 degrees C with the speed of 4.5 degrees C per minute and the temperature is maintained for 90 minutes and after being naturally cooled to 5-30 degrees C, the plate is pressed for 10 minutes at 60 Mpa pressure to obtain the product, where the epoxy resin is sold by the Shanghai Daowang Glue Technology Co., Ltd. and the type of the resin is E-44 and the weight-average molecular weight is 1,000g/mol; or boiling and soaking the flexible graphite plate for 1hour in the methanol solution of the phenolic resin (40 mass%) and drying for 24 hours at 20-30 degrees C, after solidifying for 1.5 hours at 200 degrees C, the plate is pressed for 20 minutes when the pressure is 30 MPa, the pressed flexible graphite plate is carbonized in the nitrogen atmosphere; where the carbonizing process comprises heating the plate to 350 degrees C with the speed of 5 degrees C per minute at 5-30 degrees C and the temperature is maintained for 90 minutes, heating to 700 degrees C with the speed of 2 degrees C per minute and the temperature is maintained for 20 minutes, heating to 750 degrees C with the speed of 1.5 degrees C per minute and the temperature is maintained for 20 minutes and after being naturally cooled to 5-30 degrees C, the plate is pressed for 20 minutes at 10 Mpa pressure to obtain the product and the weight-average molecular weight of the phenolic resin is 800g/mol. Preferred Components: The thermosetting resin is at least one of the epoxy resin or phenolic resin and the organic solvent in the organic solution of the thermosetting resin is at least one of the methanol or ethanol. The mass percentage concentration of the organic solution in the thermosetting resin is 10-40%, preferably 30% and the number-average molecular weight of the thermosetting resin is 200-2,000 g/mol. In the soaking step, the temperature is the boiling point of the organic solvent in the organic solution and the time is 1-4 hours, preferably 3 hours. The temperature required for drying the soaked flexible graphite plate is 20-30 degrees C, preferably 25 degrees C and the time is 12-36 hours, preferably 24 hours. The temperature required for solidifying the soaked flexible graphite plate is 20-200 degrees C, preferably 150 degrees C and the time is 0.5-2 hours, preferably 1 hour. The pressure required for pressing the solidified flexible graphite plate is 30-80 MPa, preferably 60 MPa and the time is 10-20 minutes, preferably 15 minutes. The pressure required for pressing the carbonized flexible graphite plate is 10-60 MPa, preferably 30 MPa and the time is 10-20 minutes, preferably 15 minutes. The carbonizing step comprises: heating pressed flexible graphite plate to 5-30 degrees C with the heating speed of 1-5 degrees C per minute, maintaining the temperature at 200-350 degrees C for 20-90 minutes, heating at 0.5-2 degrees C per minute, maintaining temperature at 400-700 degrees C for 20-90 minutes, heating at 1.5-4.5 degrees C per minute, maintaining temperature at 750-1000 degrees C for 20-90 minutes and reducing the temperature to 5-30 degrees C to obtain the carbonized flexible graphite plate.