Abstract: In order to study the mechanical properties of the soil-rock mixture in the landslide section of mine slope, in-situ push shear tests in large scale were carried out on the soil-rock mixture at 6 different elevations in the landslide section of Pingshuo open-pit mine slope in Shanxi Province. Index of in-situ shear strength was obtained and the effect of rock content on the index was studied. The results show that the stress-strain curves at different elevations obtained by in-situ shear tests have undergone three stages:initial deformation, elastic-plastic deformation and stress-softening deformation; as the elevation of the test site increases, the curve moves up along the y-coordinate and the peak intensity increases obviously; with the decrease of elevation, the cohesion increases and the internal friction angle decreases; the cohesion decreases slightly with the increase of the rock content at the lower and higher rock content stages, when the rock content is from 35.6% to 50.0%, the cohesion is positively correlated with the stone content; the internal friction angle is positively correlated with the rock content. The test results can provide real and effective in-situ mechanical parameters for the stability calculation of the mine landslide.