Preparation method of multilayer film of organic light-emitting device

The embodiment of the invention provides a preparation method of a multilayer film of an organic light-emitting device. The method comprises the step of preparing at least one layer of second organicfilm (2) on a first organic film (1). The step of preparing at least one layer of second organic thin film (2) on the first organic thin film (1) comprises the following steps: preparing a solution for dissolving a first organic thin film material; spin-coating a solution for dissolving a first organic thin film material on the transparent substrate to form a first organic thin film (1) on the substrate; dissolving a second organic thin film material in the first solvent A to form an organic solution; dropwise adding an organic solution on a second solvent B, standing until the first solvent Avolatilizes, and forming a film on the second solvent B to form a second organic film (2); dipping the second organic thin film (2) by using the contact surface of the first organic thin film (1) onthe substrate, and transfer