The invention relates to a system preparation method of a flexible lithium metal battery based on an Ag QD@SiO2 electrode material. The system preparation method comprises the following steps: 1) dissolving C12H25-OSO3Na and cetrimonium bromide into mixed solution of deionized water and ammonia water and performing stirring, adding tetraethoxysilane into the solution and performing stirring, performing separating to obtain a precipitate, and performing washing, drying and calcining to obtain SiO2NS; 2) stirring and placing ethylene glycol, adding ferric chloride, silver nitrate, sodium chloride, hollow silicon dioxide nanospheres and polyvinylpyrrolidone, performing stirring and placing, performing cooling, mixing the mixture with acetone, performing centrifuging and drying to obtain Ag QD@SiO2; 3) taking 10% of PVDF, adding NMP, performing stirring until NMP is dissolved, taking and grinding 10% of conductive carbon black and 80% of Ag QD@SiO2, adding the solution, performing magneticstirring, adding NMP, coating a PE diaphragm with the slurry, and taking out a pole piece; (4) cutting and pasting a tab on an aluminum-plastic film, putting the aluminum-plastic film and the pole piece into a glove box, putting the pole piece in the middle of the aluminum-plastic film, dripping LiPF6, putting the metal lithium piece in the middle of the diaphragm, and sealing the other two sidesof a soft package battery. The method has the advantages of high mechanical strength, good stability and long time.