The invention belongs to the field of mechanical engineering and metallurgy, namely to the methods of chemical-thermal treatment for surface hardening of machine parts. The method includes preliminary coating of aqueous solution, g/l: carbonic cobalt 20-30, potassium hypophosphite 20-40, tungsten acid sodium 20-40, amber sodium 100-120, malic acid 10-30, water rest. Chemical coating of aqueous solution is applied at a temperature of 90-95 °C for 45 minutes at pH solution 9-10. After that apply a cover of such a composition, mass. THE PERCENTAGE OF: boron carbide 60-55, iron oxide 20-15, charcoal 8-12, sodium fluoride 1-3, glue BF 8-10,acetone 3-5, and heated at a temperature of 1150-11200 °C for 20-25 seconds with high frequency currents. The formed hardened layer has a structure of white layers and contains borids, has a thickness of 240 microns and a microhardness of 11.5 GPa.