Car door anti-collision beam

The invention discloses a car door anti-collision beam. The car door anti-collision beam comprises front door anti-collision beams arranged on front car doors and rear door anti-collision beams arranged on rear car doors, wherein the front door anti-collision beams are obliquely arranged from front to rear; the front ends of the front door anti-collision beams are fixed between an upper hinge and a lower hinge at the front ends of front door inner plates and are close to the position of the upper hinge; the rear ends of the front door anti-collision beams are fixed at the positions close to the root parts of the lower ends of columns B on the front door inner plates; and the cross sections of the front door anti-collision beams are of bow-shaped structures. As the cross sections of the front door anti-collision beams are bow-shaped, the best energy absorbing effect of the whole anti-collision beam in a lateral collision process can be obtained, and much collision energy is absorbed; as the front door anti-col