<p>The mechanical parameters of rock mass are particularly important for underground engineering construction, and their accurate testing is a prerequisite for the stability analysis and safety control of surrounding rock. At present, the mechanical parameters of rock are obtained mainly by laboratory testing, and it is necessary to take the core of the surrounding rock at the engineering site and transport it to the laboratory for testing. The test results are difficult to reflect the mechanical properties of the rock mass in the in-situ environment. The digital drilling testing technology provides a new way to solve the above problems, and its core is to establish a rock mass parameter inversion model while drilling. The friction coefficient between the rock mass and the cutting edge of the drill bit is a key parameter for establishing the inversion model of drilling. Therefore, a method for testing the cutting friction coefficient of rock drilling is proposed in this paper. Based on the independently developed analytical geologic drill bit, the cutting force analysis of rock-breaking is carried out, and the relationship between the friction coefficient and drilling parameters is derived. Using the intelligent rotary cutting test system of rock mass, the analytical drilling cutting friction test of rock with different strengths is carried out. The response laws of horizontal and vertical forces under different drilling pressure gradients are clarified, and the friction coefficient between the rock mass and the analytical geologic drill bit is obtained. The experimental results show that the friction coefficient of rock masses with different strengths ranges from 0.23 to 0.34, with an average value of 0.29. This study provides a theoretical basis for achieving precise in-situ testing and evaluation of rock mass while drilling.</p>