The invention discloses a metallic oxide anode suitable for a Fenton system. In the invention, titanium is used as a matrix; a coating containing ruthenium and other components M is coated on the surface of the matrix, and other components M are one or more than one of iridium, titanium or stannum. The preparation method of the metallic oxide anode comprises the following steps of: pretreating a titanium plate to remove an oxidation film and surface greasy dirt, and then placing the titanium plate in 10wt% of oxalate solution for slight-boiling etching so as to make the surface formed into a rugged pitted surface; forming coating liquid by using a metal chloride and an organic solvent which is n-butyl alcohol or isopropanol; spreading the coating liquid onto the surface of the titanium plate, drying and then placing the titanium plate into a muffle furnace for oxidizing for 10min at 450-550 DEG C; taking out an electrode and cooling, and then removing loose matter from the surface; repeating the coating 10-15 times in such a way; and finally, calcining a sample at the temperature of 450-550 DEG C to convert the chloride into a corresponding oxide. The invention has simple preparation method; the prepared metallic oxide anode can obtain higher organic matter removing efficiency when being used for the Fenton system to treat waste water which is difficult to degrade, such as garbage leachate and the like.