The invention provides a via hole method applicable to a small radius T beam bridge erecting machine. The method comprises the steps of front auxiliary rod via hole, whole bridge erecting machine turning, rear transverse moving track angle adjusting, front transverse moving track angle adjusting, front support leg and front transverse moving track via hole and the like, by means of a gap between the rear transverse moving track of the bridge erecting machine and a transverse travel trolley on the middle support leg, minor angle adjustment is conducted multiple times, so that whole bridge erecting machine turning is achieved, and then T beam erecting construction on the small-radius curve is adapted. According to the via hole method applicable to the small radius T beam bridge erecting machine, the structure stress and safety of the bridge erecting machine in the small-radius T beam erecting process can be ensured. By means of the construction method, small-radius T bam erecting is achieved, and more options are provided for line type design of a precast T beam.