The utility model relates to a safety firecracker without explosives, gun powder and lead wires, which comprises an outer shell (1) paper canister. The bottom part of the outer shell is pressed tightly by a mass of paper and is used as a back cover, the inner part of the outer shell is filled with combustible gun grains on which a layer of head sealing medicine is arranged to replace a lead wire, and at last the uppermost layer is provided with a layer of paper canister cover, so the utility model is formed. The gun grains and fire sealing medicine are made of combustible materials, the head sealing medicine is used for replacing the lead wire, the gun grains are used for replacing the explosives and gun powders, and metal oxide is arranged in the paper canister. Therefore, the utility model has good sparking effect when is set off, and is safer without danger in production, in transportation, in storage and in setting off, compared with the existing firecracker.