The present invention relates to a flexible lithium battery comprising a first current collector layer and a second current collector layer, wherein the first current collector layer has a first outer surface and a first inner surface, and the second current collector layer has a second outer surface and a second inner surface; there is a glue frame sandwiched between the first inner surface and the second inner surface to form a sealed and enclosed space, wherein there is an electrochemical system layer disposed in this sealed and enclosed space, with the electrochemical system layer comprising a first active material layer, a second active material layer, and an electrically insulating layer disposed between the first active material layer and the second active material layer; and there is a flexible adhesive layer disposed between the first inner surface and the first active material layer and/or between the second inner surface and the second active material layer, wherein this flexible adhesive layer consists of an adhesive and an electrically conductive additive, with the adhesive consisting of a linearly structured colloid and a stereoscopically structured colloid.