The invention provides an accurate heat treatment quenching technology of a powder metallurgy high-speed steel precise part and belongs to the field of heat treatment of high-speed steel materials. The accurate heat treatment quenching technology is provided for the precise part made of a high-speed steel ASSAB ASP23 material imported from Sweden and comprising the main alloy ingredients of 1.28%of C, 4.2% of Cr, 6.4% of W, 5.0% of Mo and 3.1% of V. According to the accurate heat treatment quenching technology, based on different workpiece hardness requirements, different quenching temperatures are adopted, so that a small designed hardness difference needed by two interactional precise parts can be achieved; different temperature keeping times are adopted for different workpiece thicknesses, so that the hardenability of the material is reliably guaranteed, the crystal structure in the material can be accurately controlled to be refined, uniform and stable, and the parts can be good in wear resistance, long in service life, high in reliability and stable in dimension and meets the use demands for the precise parts. The accurate heat treatment quenching technology comprises the technical scheme that (1) workpieces with the thickness difference smaller than 5 mm are placed in a quenching furnace and preheated to 150 DEG C in two steps; (2) the workpieces are heated to the quenching temperature T in three steps and keep the temperature for the time t in the quenching furnace; (3) the workpieces are discharged from the furnace and air cooled to 50-70 DEG C; (4) the workpiecesare fed into a tempering furnace to be heated to 550 DEG C for tempering and keep the temperature for the time of t three times, and then the workpieces are discharged from the tempering furnace and air cooled (please refer to the figure 1).