Auxiliary measuring rod of overall dimension detector and overall dimension detector calibration method

The invention relates to an automobile detection technology, in particular to an auxiliary measuring rod of an overall dimension detector and a calibration method of the overall dimension detector. The device comprises a magnetic disk base assembly, a holder type base and a measuring rod assembly, and the magnetic disk base assembly is used for being adsorbed on the surface of a vehicle body; the holder type base is assembled on the magnetic disk base assembly, and at least part of the holder type base can movably rotate; the measuring rod assembly comprises a fixed arm and a movable arm, the fixed arm is connected with the movable end of the holder type base, a reflector is arranged on the movable arm, the movable arm is movably connected with the fixed arm, and the movable arm can move along the fixed arm. Through the universal movable end of the holder type base, the position and posture of the measuring rod assembly can be changed by 360 degrees, and a user can conveniently and rapidly adjust the measurin