The invention relates to automatic multifunctional continuous processing online equipment for a metal circular tube bar. The automatic multifunctional continuous processing online equipment comprises an automatic preparation mechanism, a saw cutting mechanism, an automatic chamfering machine detection mechanism, an automatic cleaning mechanism and a pipe fitting conveying mechanism, wherein the tail part of the automatic preparation mechanism is connected with the saw cutting mechanism; the automatic chamfering machine detection mechanism is connected to the back side of the saw cutting mechanism; the automatic cleaning mechanism is connected to the back side of the automatic chamfering machine detection mechanism; and the pipe fitting conveying mechanism is connected to the back side of the automatic cleaning mechanism. The automatic multifunctional continuous processing online equipment has the beneficial effects that the cut-off, chamfering, detection and inner and outer wall cleaning of pipe fittings are finished automatically in one step without gradually operating on a plurality of machine stands, so that the production efficiency is increased, and the labor and cost are saved; and the machine stand is compact in structure, and is scientific and reasonable in design, has the outstanding advantages of high automatic degree, easiness in operating, running stability, high processing accuracy and the like, and is highly-innovative composite processing equipment integrating automatic cut-off, chamfering, detection and inner and outer wall cleaning.