The invention discloses an induction heating coaxial transformer. The induction heating coaxial transformer comprises an outer metal cylinder, wherein a front end cover plate and a back end cover plate are arranged at the front and back ends of the outer metal cylinder respectively for sealing; an annular magnetic core is arranged in the outer metal cylinder; the annular magnetic core is provided with an insulating wire used for forming a primary side winding; one end of the insulating wire is connected with a primary side wire-outlet terminal on the back end cover plate; a center hollow rod is also arranged in the outer metal cylinder; and the center hollow rod runs through the annular magnetic core to be connected with a water inlet interface and a water outlet interface in the front end cover plate and the back end cover plate respectively for forming a secondary side loop for realizing power output. The induction heating coaxial transformer is simple in structure, and easy to realize batch production; the volume and the weight of the induction heating coaxial transformer are reduced in a multiplied manner compared with those of a common transformer of the same power, so that the automatic integration production cost is lowered; and in addition, the induction heating coaxial transformer is small in size, convenient to replace, capable of ensuring consistency of manufacturing process and performance due to that the parts adopt mechanical processing and standard parts, and capable of reducing influence on the transformer from heating consistency of the same kind of products.