The invention discloses a low-odor sterilizing micro-foaming spray-free polypropylene composite material and a preparation method thereof. The polypropylene composite material is prepared from high crystalline polypropylene, micro-ball foaming agent, scratch-resistant resin, low volatile substance adsorbent, encapsulated enzyme, nano photocatalyst, a lubricant, and antioxidant according to parts by weight. The low volatile substance adsorbent has very strong adsorption and can effectively prevent forming parts of the composite material from generating low volatile harmful gases; the encapsulated enzyme and nano photocatalyst can decompose the low volatile harmful gases of the material into harmless carbon dioxide and water; and the high crystalline polypropylene has lower density, higher elasticity and proper rigidity after micro-ball foaming treatment. The material prepared by the method has good mechanical property, is light, resists heat and aging, is weather resistant, scratch resistant, and antistatic, has low odor, and contains low TVOC, thereby being applied to fields like automotive interior and high-grade decoration.