At present, there are few and immature researches on the combined retaining structure of anti-sliding micro-pile and connected beam, and there are some leading theoretical researches in engineering practice. In order to explore the sliding resistance effect and stress failure law of the multi-row oblique connected micro-pile frame composite structure laid on the slope surface, this paper adopts the method of similar model test and draws the following conclusions: When the settlement displacement of the model slope top reaches 200mm, the load on the top of the slope is 7.5T, 26.5t and 36.5t respectively under three working conditions. The micro-pile frame beam structure with multiple rows of oblique connections can effectively improve the bearing capacity of the slope, and reducing the pile spacing can also improve the bearing capacity of the slope. From the top of the slope to the foot of the slope, the failure modes of each row of micro-piles are different, and the bending failure of the sliding section weakens successively. The upper part of the pile is positive bending moment, the lower part is negative bending moment. The dividing point of positive and negative bending moment is located at a certain position above the sliding surface, and the maximum point of bending moment is 2~3 times the pile diameter below the sliding surface. The soil resistance of micro-piles near the top and foot of slopes is relatively large, so the bending resistance of these micro-piles should be paid more attention to in engineering design. The experimental results have reference significance for understanding the supporting effect and failure mode of multi-row inclined micro-pile frame beam structure.