Abstract: A ceramic steel, which is composed of a ceramic phase and a metal phase. The ceramic phase is the boride consisted of one or more elements of Fe, Co, Ni, and one or more metal elements of IVB, VB and VIB of the fourth, fifth and sixth periodic metals. And the metal phase is an alloy composed of Mo and one or more metal elements of Fe, Co, Ni. The ceramic steel has properties of high hardness, excellent wear resistance, corrosion resistance, high temperature resistance, and has good weldability with steel and other metal materials. The ceramic steel can be used for producing knives, cutting tools, and all kinds of wear resistant, corrosion resistant, high temperature resistant materials and all kinds of structural components.