The invention relates to a large medical device treatment bed and belongs to the field of medical devices. The large medical device treatment bed comprises a bed rotating assembly. A bed base is hinged to the bed rotating assembly, a lifting assembly is fixed on the bed base and is provided with a bracket assembly, the bracket assembly is provided with a lateral moving assembly, the lateral moving assembly is connected with the bracket assembly through a horizontal bearing, a longitudinal assembly is connected with the lateral moving assembly through a longitudinal bearing, and the bracket assembly is provided with a driving device. The large medical device treatment bed can automatically accurately correct errors on line and is high in running precision, safe and reliable.