Abstract: In order to study the influence law of limestone stone powder admixtures on the working properties and mechanical properties of high-strength polypropylene fiber concrete grouting materials, this paper compares and analyzes the performance of high-strength concrete grouting materials with different stone powder dosages through fluidity tests, compressive tests and flexural tests. The results show that the addition of an appropriate amount of stone powder can effectively improve the working performance of the grouting material. When the dosage of stone powder is 10.0%, the increase in the initial fluidity and 30-minute fluidity of the grouting material both reach more than 9.8%. Its working performance is the best and the degree of fluidity loss is relatively small. Meanwhile, when the content of stone powder increased from 0% to 16.0%, the compressive strength of the grouting material at 7 days and 28 days significantly increased and reached the peak, increasing by 34.4% and 39.9% respectively. When the proportion of stone powder is 4% to 10%, the enhancement effect of the flexural strength of the specimens is better and all remain above 15 MPa. This study provides a reference for qualitative analysis and improvement of the composition of stone powder materials in high-strength polypropylene fiber concrete grouting materials, and for further enhancing the overall performance.