NOVELTY - A porous fiber gel polymer electrolyte comprises polyvinylidene fluoride, polymethyl polymethacrylate, nano silicon dioxide, and liquid electrolyte. The weight ratio of polyvinylidene fluoride to polymethyl polymethacrylate is 0.2-5:1. The weight ratio of nano silicon dioxide to polymethyl polymethacrylate is 0.02-0.15:1.    USE - A porous fiber gel polymer electrolyte.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing porous fiber gel polymer electrolyte comprising mixing ethyl silicate and ethanol at a volume ratio of 0.027-0.053:1 and blending at 40 degrees C; and adding the mixed liquid of ammonia water and deionization water into the solution. The volume ratio of mixed liquid of ammonia water and deionization water/the solution is 0.081-0.167:1 and the volume ratio of the ammonia water to the deionization water is 1.79-7.14:1. The solution is blended for 3 minutes and continuously blended for 3-5 hours to obtain silicon dioxide gel solution. The gel solution is centrifuged and washed by ethanol and N,N-dimethyl formamide solution. At room temperature, under the blending condition, the polyvinylidene fluoride and the polymethyl polymethacrylate in the weight ratio of 0.2-5:1 are dissolved into N,N-dimethyl formamide solvent to form 5-15 wt.% of solution. The solution is added into the nano-silicon dioxide. The amount of nano-silicon dioxide is 2-15% of total weight of polyvinylidene fluoride and the polymethyl polymethacrylate. The solution is blended and supersonic dispersed. Electrostatic spinning is used to spin the uniform solution into fiber films with diameter of 80-260 nm. The electrostatic spinning voltage is 10-20 KV. The distance between the injector head and the receiving plate is 10-15 cm and the flow speed of the electrostatic spinning solution is 0.2-0.8 ml/hour. The fiber films are heated in vacuum and dried. The residual water content and water are removed. The fiber films are dipped into the electrolyte solution for 30-60 minutes, and dried under the protection of nitrogen gas.