The utility model relates to an auxiliary tool for the applying and the repairing of a car and provides an improved car door stand bar aiming to overcome the structural defect that the existing car door stand bar has worse stability. The improved car door stand bar is characterized in that a fixing rod is arranged to be a right angle type bent bar, one side of which is provided with a connecting bar inside, the tip of the connecting bar is provided with a cross bar, and two ends of the cross bar are respectively provided with a fastener. According to the proposal, because the two fasteners are respectively arranged on two points outside the plane of the fixing rod, and the stand bar is installed by artfully utilizing the existing technical plug hole in the carriage, the use practice proves that the improved stand bar has the characteristics of firm fixation, convenient use and good stability. The improved car door stand bar is a beneficial improvement.