The invention belongs to the field of preparation of cigarette and especially to a preparation method for a PP fiber used for a cigarette. The method comprises the following steps: dissolving pullulan polysaccharide in water to prepare an adhesive solution with a mass percent concentration being 0.1 to 0.8%; and allowing a PP fiber bundle to pass through the pullulan polysaccharide adhesive solution to realize continuous dipping and coating of the PP fiber. The invention has the following advantages: after filtration by a cigarette filter made of the pullulan polysaccharide modified PP fiber, respective content of phenolic compounds, benzo[a]pyrene, crotonaldehyde, ammonia, CO, tar, nicotine, hydrocyanic acid and the like in smoke of the cigarette is substantially reduced; through modification, the filter has substantially improved adsorption performance on harmful components in the smoke, an obvious effect is exerted on reduction of harm of the cigarette, and sensory quality of the cigarette can be substantially enhanced.