Negative plate preparation method, negative plate and battery

The invention provides a negative plate preparation method, a negative plate and a battery. The preparation method of the negative plate comprises the following steps: providing the copper foil; performing ultrasonic shot blasting operation on the copper foil to form a microcrystal wrinkle layer on the surface of the copper foil; coating the microcrystal fold layer to form a rough active material layer on the surface of the copper foil to obtain a semi-finished product of the negative plate; and carrying out rolling operation on the negative plate semi-finished product to obtain the negative plate. According to the preparation method of the negative plate, the contact area of the copper foil and the active material is enlarged, and the active point positions are increased, so that the transfer probability of charges between the copper foil and the active material layer is increased, the charge transfer efficiency of the contact interface of the copper foil and the active material layer is improved, and the cy