The invention provides a lead-carbon battery negative plate and a preparation method therefor. The negative plate comprises a plate grid and a negative electrode material for coating the plate grid, wherein the negative electrode material comprises an additive and more than one composite lead-carbon paste layer; and the carbon contents of the composite lead-carbon paste layers are gradually increased from the plate grid to the outer surface of the negative plate. According to the lead-carbon composite gradient negative plate obtained by the technical scheme of the invention, the corrosion layer formed between the plate grid and the lead paste is high in adhesion effect; a transmission channel with an excellent performance is established between the interior of the electrode and the external electrolyte, so that the migration rate of reaction ions is improved, and an effect of restraining negative electrode sulfation is achieved; the capability of charge acceptance of the prepared lead-carbon battery is improved by 1-2 times; the softening and falling off the negative electrode material in the cycle process are avoided; and the cycle life of the battery is prolonged.