The invention relates to high-temperature-resistant steel. The high-temperature-resistant steel is characterized by comprising the following components in percent by mass: 24.0-28.0% of Cr, 2.3-3.0% of Mo, 2.0-3.3% of Si, 0.2-0.4% of C, 1.0-2.0% of Mn, 18.0-23.0% of Ni, 1.0-3.0% of Nb, 0.1-3.0% of Cu, 2.0-3.5% of W, 0.01-0.035% of P, 0.2-0.4% of S, 0.1-0.3% of N and the balance of Fe, wherein the sum of the percents of the components is 100%. As-cast hardness of the high-temperature-resistant steel can be 230-360HV10, heat resistant, free-cutting, acid resistant and corrosion resistant properties are greatly improved, the high-temperature-resistant steel is applicable to a high temperature working environment, a working temperature can be 800-1000 DEG C, the high-temperature-resistant steel can be used for producing a charging turbine and other high temperature parts, and the high-temperature-resistant steel is simple in production process, low in production cost and easy to popularize and apply.