According to the geological conditions of intermediate weathered sandstone ground, static load test of single anchor foundations and group anchor foundations were carried out. Based on the test results, the typical failure modes and the ultimate uplift bearing capacity of foundations are analyzed. Internal force distribution and effective anchorage depth are investigated through strain measurements. The results show that the rock anchor foundation can meet the bearing requirements of the upper structure for transmission line engineering. Rock anchor foundation benefits economically and socially when applied to intermediate weathered sandstone ground. When the anchorage depth of anchor is less than effective anchorage depth, the uplift bearing capacity of foundations can be improved by increasing anchorage depth and rock-socket depth. Horizontal load can affect the uplift stability of group anchors foundation adversely although it is not a control factor of foundation failure.