The invention discloses an environmental-friendly flame-retardant material dedicated for polypropylene and the preparation method. The material is composed of the following raw materials based on weight proportion: 35-68% of polypropylene resins, 20-35% of built flame retardants, 2-10% of inorganic material, 5-10% of nylon resin, and 5-10% of compatibilizer. The preparation method of the special material is as follows: the raw materials prepared based on the formula are evenly mixed in a high-speed mixer and then the mixture is added to a twin-screw extruder; the barrel temperature of the twin-screw extruder is controlled to reach 185 to 200 DEG C; the mixture is mixed in the twin-screw extruder and extruded and then cut into granules to get the flame-retardant modified material dedicatedfor polypropylene. The flame-retardant modified material dedicated for polypropylene of the invention has good fire-retardant properties, excellent mechanical properties, low cost of raw materials and less smoke in the flame-retardant process; besides, the material meets the RoHS Directive and other environmental protection requirements.