The invention discloses an automobile handrail which comprises a supporting base. A fixing bolt is arranged on the outer wall of a supporting platform, a sliding platform is arranged at the top end of the supporting platform and slidably connected with the supporting platform, a fixing bolt sliding groove is formed in the outer wall of the sliding platform and slidably connected with the fixing bolt, a box is arranged at the top end of the sliding platform, a fixing seat is arranged at the top end of the box, a handrail base is arranged at the top end of a storage box, and a supporting handrail is arranged at the top end of the handrail base. Through slidable connection between a sliding rod and the sliding groove, the position of the supporting platform on the supporting base can be adjusted; through slidable connection between the supporting platform and the sliding platform, the fixing bolt is loosened, and the sliding platform is enabled to slide up and down in the supporting platform; the fixing bolt slides in the fixing bolt sliding groove, and after being adjusted to a proper height, the fixing bolt is tightened to fix the sliding platform into the supporting platform.