In order to select a reasonable ratio of soft rock similar materials to ensure the reliability of the model test results, considering the characteristics of low strength and strong hydrophilicity of soft rock, which is easy to cause landslide formation under external loads such as earthquake and rainfall, bentonite is added to simulate the hydrophilic characteristics of soft rock on the basis of traditional similar materials. The orthogonal test design of three factors and four levels was used to carry out the similar material ratio test. In 16 groups of samples with different ratios, the five physical and mechanical parameters of density, cohesion, internal friction angle, compressive strength and elastic modulus were tested. The sensitivity analysis of the above physical and mechanical parameters was carried out by range and variance analysis. The results of the data analysis indicate that the soft rock similar materials with different mixing ratios have a wide range of distribution of physico-mechanical parameters, which can basically meet the demand for soft rock similar materials in soft rock landslide model tests. The sensitivity of the density of similar materials to bentonite dosing and glycerol content is comparably high. The compressive strength and elastic modulus are significantly affected by glycerol content. The cohesion changes significantly with the change of glycerol content and bentonite content. The internal friction angle decreased with the increase of glycerol content, and tends to increase and then decrease with increasing bone glue ratio. The results of this study can provide a reference for soft rock similar material ratio in landslide modelling tests.