TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation: The preparation method of the polymer lithium vanadium phosphate power battery comprises: (a) preparing sizing agent: preparing the sizing agent for positive pole with N-methyl pyrrolidone as the solvent, roasting lithium vanadium phosphate and conductive agent for 8-16 hours at 80-120 degrees C; where the conductive agent is conductive carbon black, superconducting carbon, crystalline flake graphite, or carbon nanotube; the solid content of the sizing agent is 35-45%; adding polyvinylidene fluoride into N-methyl pyrrolidone, mixing in vacuum for 2-4 hours, adding the mixture of lithium vanadium phosphate and conductive agent, mixing for 3-8 hours, obtaining sizing agent that is operated for 150 meshes and 2-3 screen analysis; preparing sizing agent for the negative pole, adding the carboxymethylcullulose sodium into the deionized water, mixing for 1-3 hours, adding conductive agent with mixing for 2-4 hours; where the sizing agent is coated and milled to make the conductive agent completely disperse; adding negative materials with mixing for 2-5 hours, adding styrene-butadiene rubber (SBR) with mixing for 2-3 hours, obtaining sizing agent that has to be operated for 150 meshes and 2-3 screen analysis; (b) lacquer coating on positive and negative poles: obligating the tab lead position according to requirement of design; where the lacquer coating on positive pole is applied with aluminium foil with thickness of 16-30 mu m; the concentration of the lacquer coating surface of positive pole is 6-20 mg/cm2; the roasting temperature of the lacquer coating on positive pole is 90-120 degrees C; the lacquer coating on positive pole is applied with electrolytic copper foil that has current collector of negative pole with thickness of 10-20 mu m; the concentration of the lacquer coating surface of negative pole is 4-8 mg/cm2; and the roasting temperature of the lacquer coating on positive pole is 80-100 degrees C; (c) rolling in the pole pieces; where the compacted density of the positive pole is 1.5-3.5 g/cm3; and the negative pole is 1.2-1.6 g/cm3; (d) transecting or slitting the pole pieces: transecting or slitting the pole pieces that have been rolled-in according to production specifications of pole pieces of the battery; (e) roasting the pole pieces: roasting the pole pieces in the condition of vacuum with pole pieces of the positive pole for 12 hours at 110-130 degrees C; (f) preparing the battery cell; where the battery cell comprises positive pole, negative pole, and membrane; the battery cell is of membrane/negative pole/membrane/positive pole stacked structure; and the membrane is polyethylene-polypropylene-polyethylene membrane with thickness of 12-13 mu m; (g) welding the tab lead of positive and negative poles: welding the tab lead of positive and negative poles on the obligating current collectors of the pole pieces of the positive and negative poles with process of super-welding to avoid rosin joint; (h) encapsulating and packing the battery cell: packing the stacked battery cells in the shell of battery, and using closing machine to heat-seal the top and one side wall of battery at 150-250 degrees C with pressure of 0.2-0.5 MPa for 5-10 seconds; (i) roasting the battery cell: roasting the battery cell for 24 hours at 80-120 degrees C, cooling at less than 40 degrees C; (j) filling the battery and thermalpolymerization: pouring gel electrolyte into the battery with battery cell and heat-sealing the other side wall of the battery; where the gel electrolyte is polymerized at 60-120 degrees C with pressure of 0.5-2.5 KPa for 2-30 minutes; and (k) battery formatting and grading: applying limited formatting, de-airing, heat-sealing, cutting the edge and shaping to the battery; grading, and charging with constant voltage of 4.6 V; and discharging. Preferred Composition: The grain diameter of the lithium vanadium phosphate is 0.1-12 mu m. Preferred Components: The negative material is artificial graphite, natural graphite, mesocarbon microbeads (MCMB), or hard-carbon material. The shell of battery is made of aluminum plastic films.