Abstract: Research on the bearing capacity characteristics of double inclined piles embedded in rock with karst geological conditions is limited. Eight groups of model tests are designed to investigate the horizontal-load bearing characteristics under constant vertical loading for double inclined piles considering the complex situation where double inclined piles unilaterally through a karst cave focusing on variable include pile inclination angle, cave diameter, and cave roof thickness. The test results indicate that the bearing capacity of the double inclined pile system shows minimal variation under low vertical loads, with settlement increasing by 37.8% only when passing through a larger cave diameter of 6d, accompanied by the risk of buckling failure. The pile inclination angle significantly enhances the horizontal bearing capacity of the pile foundation under constant vertical loading. The safe thickness of the karst cave roof is approximately 2d, below which the horizontal bearing capacity of the pile foundation decreases quickly. The double inclined pile system failure mode of bending instability of the pile shaft would convert to instability of the bearing stratum by large cave diameters and thin cave roof thickness.