PURPOSE: A magnetron cooling device is provided to induce cooling water to the other side by partially dividing an inside of a waterway part. CONSTITUTION: A cylindrical anode includes at least two or more anode vanes(200) which are radially formed in the inside thereof. A cooling water tank is formed to surround the outside of the anode. A barrier rib is located in the inside of the cooling water tank to distribute the cooling water into one side and the other side. A waterway part(210) is depressed from the outside to the inside of the anode and is formed at the anode vane. An insertion part(220) is inserted into the waterway part to close a part of the waterway part.
