: The experimental study of reaction kinetics of acid rock is an important part of the acid fracturing technology to guide acid fracturing and optimize the design and acid system. In this article, Chengdu University of Technology independently designed the “Different viscosity acid-rock reaction simulation equipment”, which was used for testing rate of acid-rock reaction , based on the analysis of the experimental data and Three-dimensional laser scanning data, Discuss the effect of true surface-volume on Kinetic equations , the rate of acid-rock reaction increases with increasing the surface-volume ratio, The main effect of the true surface-volume ratio on the reaction kinetics of acid rock is to influence the reaction velocity constant K, which increases with increasing the true surface-volume ratio. The research results of this paper provide a basis for more accurate design and evaluation of acid fracturing effect.