Method for preparing all-solid-state battery by dry method and all-solid-state battery

The invention provides a method for preparing an all-solid-state battery by a dry method and the all-solid-state battery. The method comprises the following steps: preparing negative electrode mixed powder and sulfide solid electrolyte mixed powder; in a water-free and oxygen-free environment, spraying the negative electrode mixed powder onto a substrate by using electrostatic spraying equipment, and curing to obtain a pre-lithiated negative electrode layer; spraying sulfide solid electrolyte mixed powder on the surface of the pre-lithiated negative electrode layer by using electrostatic spraying equipment, and curing to obtain an electrolyte layer; and compounding the positive electrode material subjected to dry film formation with the other side of the electrolyte layer, and assembling to obtain the all-solid-state battery. The invention provides the preparation method of the all-solid-state battery without solvent participation in the whole process, and the technical problems of low initial coulombic effic