The embodiment of the invention provides a high polymer solution for forming a negative electrode material layer, and the high polymer solution comprises a compound of metal ions and various types of acid ions, a high polymer and a solvent. The embodiment of the invention also provides a negative electrode material layer comprising the material layer formed by the high polymer solution, a negative electrode provided with the negative electrode material layer, and a battery. The high polymer solution provided by the embodiment of the invention has an adhesive effect so that physical and chemical properties of the material layer can be attached and modulated, and the cost of the high polymer solution is low.