The invention relates to a lithium-ion secondary battery and a manufacturing method thereof. The battery comprises a positive electrode flake, a negative electrode flake, a diaphragm, electrolyte and a packaging shell body; positive electrode materials of the positive electrode flake comprise lithium salt with the positive electrode reversible extraction of lithium ions, a carbon conductive agent and a binding agent; the weight percentage of the three positive electrode materials is as follows, the lithium salt is 80 percent-98 percent, the carbon conductive agent is 0.5 percent-18.5 percent, and the binding agent is 1.5 percent-19.5 percent; negative electrode materials of the negative electrode flake comprise one of the lithium salt with the negative electrode reversible extraction of lithium ions, oxides with reversible extraction of lithium ions and sulfides with reversible extraction of lithium ions or the combination thereof, the carbon conductive agent and the binding agent; the weight percentage of the three negative electrode materials is as follows, the lithium salt is 80 percent-98 percent, the carbon conductive agent is 0.5 percent-18.5 percent, and the binding agent is 1.5 percent-19.5 percent; the electrolyte of electrolyte fluid is soluble lithium salt or lithium hydroxide which can not react with water, and the solvent is water or the organic solvent. The method comprises the steps of producing and packaging the positive and the negative electrode flakes, the diagram, the electrolyte and a battery cell and into the shell. The invention reduces the manufacturing difficulty and the production cost of the lithium-ion secondary batteries and expands the types and the scope of application of the lithium-ion secondary batteries.