A method of heat treatment of high-speed steel tool, wherein the tool is heated to a hardening temperature, is maintained, cooled to ambient temperature and carried rental, characterized in that after heating to tempering temperature and holding at this temperature the tool is cooled in a salt bath at a temperature of 810- 860 ° C with exposure to 1.9-2.0 / mm but not more than 1 minute, further cooling the tool with a thickness (diameter) of the working part is not more than 20 mm to ambient temperature is carried out in air, for a tool with thickness (diameter) of the working part 20 mm cooling is carried out in liquid media, and then air cooled to ambient temperature.
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