Method for preparing polyimide solution and serosity thereof

The invention relates to a method for preparing polyimide solution and serosity thereof. The method includes the steps: dianhydride and diamine are dissolved in organic solvent to prepare polyamic acid solution, reaction is carried out under the state of vacuum-pumping and low pressure to directly form the polyimide solution and serosity, and the state of the polyimide solution or the state of theserosity is different from the state of common solid polyimide dissolved in the organic solvent; the polyimide solution, the serosity thereof and other resin, such as epoxide resin, can form cross-linked netty structure piece materials or films, or the polyimide solution and the serosity can be directly used as Chinese varnish or be coated on an electronic device or a soft printed circuit board so as to form a coating layer, therefore, the polyimide resin film can be conveniently formed; or the solvent is removed to directly prepare the polyimide resin.