Automatic necking device for round pipe

The invention relates to the technical field of round pipe machining, and provides an automatic round pipe necking device which comprises a feeding mechanism, a necking mechanism and a driving mechanism. The feeding mechanism comprises two mounting seats which are oppositely arranged, two material placing assemblies and two material receiving assemblies; the two material placing assemblies are arranged in a spaced mode, each material placing assembly comprises a material placing part and a material blocking part, the material placing parts and the material blocking parts are arranged between the two mounting bases, and a discharging channel allowing the single round pipes to sequentially pass through is formed between the material placing parts and the material blocking parts; the material receiving assembly is arranged at the discharging end of the discharging channel, the material receiving assembly is used for receiving the circular pipes of the discharging channel, and the material receiving assembly is d