The invention provides a method for improving the corner fold of a soft-clad lithium battery, the method comprising the following steps: punching holes: punching an aluminum-plastic film by using a mold to form a square pit on the aluminum-plastic film; dropping glue: adopting a dropping glue process, dropping the hot melt glue on four corners of the pit until the hot melt glue solidifies, and firmly bonding the hot melt glue with the aluminum plastic film after solidification; packaging: putting the laminated core into the pit of aluminum-plastic film for packaging, and preparing the finishedcell according to the normal process. Dropping hot melt glue at the four corners of the pit of the aluminum-plastic film has the functions of filling angles and reinforcing ribs; on the one hand, theinvention can resist the corner folds even edges and corners caused by negative pressure when vacuum is pumped, thereby reducing the risk of corner damage and improving the quality of the cell; on the other hand, the angle position of the laminated core can be prevented from directly contacting with the aluminum plastic film, so that the risk of the angle position corrosion can be further reduced. The method of the invention is simple and easy to operate, is convenient for batch production, and can greatly improve the quality of the battery cell and generate great economic benefit.