The invention discloses a rubber toughened polypropylene compound and its application. The rubber toughened polypropylene compound comprises 45-69 parts of polypropylene, 15-25 parts of talc powder, 15-25 parts of an elastomer and 1-5 parts of a lubricant. The lubricant is a compound of an inner lubricant and an outer lubricant in a mass ratio of 1: 4 to 4: 1. The polypropylene/talc powder/elastomer compound system utilizes combination of the inner lubricant and the outer lubricant in a ratio in a certain range so that surface tension of the elastomer and polypropylene is reduced in mixing, the average particle size of the elastomer in the polypropylene matrix is effectively reduced, good dispersion of the elastomer in the polypropylene matrix is promoted, the material has excellent impactresistance at the normal temperature and low temperature, material rigidity is greatly improved, reduction of material rigidity is prevented obviously and the development of automotive interior materials is satisfied.