The machine is suitable for the welding of concrete poles and prestressed concrete poles. It can solve the problem of reducing the diameter of 1：75 degree cone，low welding strength of construction rebar and bracket automatic servoing. The problem is characterized by high efficiency，firm welding， fast forming， high precision，and small diameter error. In the welding process， the main rib cage does not rotate， the ring rib spin，the pitch can be set freely according to requirements. and has the functions of automatic cage taking off and unloading. The automatic welding mechanism is adopted to make the cage welding firmer.