A new NiCrNiSi thinfilm thermocouple temperature measurement tool was developed with preparing NiCrNiSi thinfilm on the rake face of PCBN tool by Magnetron sputtering method. The process of thinfilm thermocouple preparation was described in detail. With WS2005 automatic coating adhesion scratch tester and Jsm5610 scanning electron microscope, the adhesion and composition of NiCrNiSi film were tested and analyzed respectively. The cutting experiment on site shows that the developed temperature measurement cutting tool of NiCrNiSi film thermocouple can quickly and accurately measure the cutting temperature in real time.