The invention discloses a negative electrode lead plaster of a start-stop battery. The negative electrode lead plaster is prepared from the following components in percentages by weight: 0.1% to 1.0% of carbon fiber, 0.1% to 0.5% of graphene, 5.0% to 10% of active carbon, 5.0% to 10.0% of barium sulfate, 2.0% to 5.0% of humic acid, 1.0% to 5.0% of lignin, 5% to 10% of dilute sulfuric acid and the balance of lead powder. According to the negative electrode lead plaster, the cycle life of the battery can be prolonged, the battery capacity is increased, and the charging and discharging capacity of the battery is also maintained.