The invention relates to a porcelain tube automatic processing device. The porcelain tube automatic processing device comprises a machine frame. Processing mechanisms are arranged on the machine frame. Conveying mechanisms are arranged on the opposite sides of the left processing mechanism and the right processing mechanism. Each processing mechanism comprises a cutting mechanism, a polishing mechanism and a punching mechanism. The cutting mechanisms, the polishing mechanisms and the punching mechanisms are arranged in sequence. Each conveying mechanism comprises a supporting block assembly and a sliding rail assembly. The sliding rail assemblies are arranged in an inclined mode. The supporting block assemblies support workpieces to the sliding rail assemblies so that the workpieces can slide along the sliding rail assemblies in an inclined mode. The supporting block assemblies and the sliding rail assemblies are arranged in a mutually staggered mode. Each sliding rail assembly comprises a first sliding rail, a second sliding rail, a third sliding rail and a fourth sliding rail, and the first sliding rail, the second sliding rail, the third sliding rail and the fourth sliding railof each sliding rail assembly are connected in sequence. Each supporting block assembly comprises a first supporting block, a second supporting block, a third supporting block and a fourth supportingblock. The workpieces are conveyed by the conveying mechanisms to the cutting mechanisms, the polishing mechanisms and the punching mechanisms to be processed, the processing operation of the workpieces can be automatically and orderly conducted, the operation conducted by workers is not required, the working efficiency is greatly improved, and the yield of products is improved.