Preparation method of positive plate, positive plate and battery

In order to solve the problems that the tail of an existing positive plate is difficult to enter a shell and the tail is prone to burr short circuit, the invention provides a preparation method of the positive plate, and the preparation method comprises the following preparation steps: pasting an adhesive tape on the edge of a first surface of a positive current collector, and pre-pressing; coating a non-adhesive tape sticking area on the first surface of the positive current collector and a second surface with a positive active material layer, and rolling to form a positive plate; removing the adhesive tape on the surface of the positive plate; the adhesive tape is pasted on one side of the tail part of the positive electrode current collector, so that compared with a two-side adhesive tape pasting process, the adhesive tape pasting area is reduced, the positive electrode powdering amount is increased, and the battery capacity is improved; meanwhile, the compaction density of the tail part of the positive po