The invention discloses a lithium battery encapsulation head and an encapsulation method for preventing electrochemical corrosion. The head comprises a strip-shaped body, one side of the strip-shapedbody and a surface of an R angle are plated with a heat insulating layer, and the heat conductivity of the heat insulating layer is <= 200 W/m.K. The packaging method comprises the following steps: flushing the aluminum-plastic film, top side sealing, injecting electrolyte, standing, forming and fixture shaping, wherein the lithium battery packaging head is used for packaging the aluminum-plasticfilm during the top side sealing step. By plating a thermal conductivity <= 200 W/m.K insulation layer on one side of the head and on the surface of the R angle, In addition, the invention ensures that no excess electrolyte further damages the inner layer structure of the PP, forms an ion channel of electrochemical corrosion, and achieves the purpose of preventing electrochemical corrosion throughthe calculation of the optimal electrolyte quantity.