The invention discloses a car radiator protecting plate and a production method thereof, belonging to the field of radiator protecting plates. The technical problem to be solved is how to ensure synchronous expansion of a protecting plate and a radiating tube without generating excessive internal stress, thus effectively prolonging the service life of a car radiator. The technical scheme is that: the car radiator protecting plate is characterized by comprising a body part, flange parts and concave bent parts, wherein the concave bent parts are arranged at two ends of the body part, and the body part and the concave bent parts form a protecting plate with a U-shaped bent longitudinal section; the flange parts are arranged on two sides of the body part, the flange parts are provided with a plurality of openings, and the body part and the flange parts form a protecting plate with a U-shaped bent cross section; the middle of the body part is provided with an expansion joint structure. The production method of the car radiator protecting plate comprises blanking, punching, trimming and forming.