The invention discloses a method for preparing high purity tetrabasic lead sulfate by using lead powder used for production of a lead acid battery, which is characterized in that a simple two-step reaction method is used for preparing the tetrabasic lead sulfate, the product purity is high, the particle size is small, the distribution of the particles is uniform, the product raw material lead powder is same with the lead powder used for producing the lead acid battery, impurity is not introduced, no impurity pollution problem is existed, and no adverse influence is generated to cell performance, the lead powder can be taken as an additive for obviously increasing the cell pole plate strength, the capacity loss of the cell at an initial stage is reduced, the cell cycle life is prolonged, in addition, no waste water and waste lead can be generated during a production process, and the method is green and has performance of environmental protection.