The invention relates to an antistatic smokeless sulfur-free firecracker nitrate agent and a preparation method thereof, belonging to the field of environment-friendly pyrotechnic compositions. The firecracker nitrate agent comprises, desensitized hexogen, nitrified bamboo cellulose, modified ammonium dinitramide, magnesium stearate, 1,3-dimethyl-1,3-diphenyl urea, dicyandiamide, amino silicon oiland an antistatic agent. According to the invention, desensitized hexogen is used as a main component, and modified ammonium dinitramide is used as an oxidant, so an oxygen content is sufficient, andcombustion effect is ensured; the nitrified bamboo cellulose, 1,3-dimethyl-1,3-diphenyl urea, magnesium stearate and dicyandiamide are adopted, and the antistatic agent and amino silicone oil are added, so the mechanical properties, stability and antistatic capacity of the firecracker nitrate agent can be remarkably improved, and the safety and reliability of the firecracker nitrate agent in theprocesses of production, storage and use are guaranteed; meanwhile, the firecracker nitrate agent does not contain a sulfur element or any metal powder, so the preparation of the smokeless sulfur-freefirecracker nitrate agent can be truly realized.