Taking the Pingdingshan No.6 Mine New Ming inclined shaft engineering as an example, and on the basis of the analysis of the surrounding rock failure mechanism and grouting reinforcement mechanism, this paper studies the inclined shaft through the goaf grouting reinforcement parameters, especially the best reinforcement range. Through analyzing the different grouting range surrounding rock deformation and stress distribution of roadway across the caving zone by using FLAC3D numerical simulation software, this paper determines that the Ming inclined shaft through the goaf caving with best grouting reinforcement is 4.5 m, in which grouting hole deep is 3 m, and radius of grouting is 1.5 m.