The utility model relates to a radiator protective shield for automobile cooling system, which solves problem that the prior radiator is exposed on the automobile frame bottom directly and is easy to be damaged by mud block, ice block or stone block leading to water leakage. The radiator protective shield are distributed blowholes evenly on the surface, continuous adjacent three side edges bend upwards, the middle edge with bending upwards connects with an installing convex edge parallel with the radiator protective shield, another two side edges with bending upwards connect with the convex block respectively; the installing convex edge and the convex block are equipped with an installing hole respectively. The radiator protective shield is installed on the automobile frame, the protective shield back end extends to two third of the radiator lower chamber, and keeps 10mm clearance with the radiator lower chamber in vertical direction, the radiator protective shield can avoid the radiator being destroyed by carpolite, clod or ice snow directly when the automobile drives on poor road and thick snow. A waist shape hole on the radiator protective shield can reduce weight, satisfy radiating requirement and keeps radiating performance of the cooling system in summer.