Considering the nonlinear characteristic of soil materials, the nonlinear strength criterion and the associated flow rule were used to construct the curved failure mechanism and kinematically admissible velocity field of the strip plate anchor buried near a slope. The curved failure mode and upper bound solution of the uplift bearing capacity were derived based on the upper bound theorem of the limit analysis. Then, with the aid of DIC technology, a series of uplift load tests were conducted in laboratory for scaled strip plate anchor models, which were buried in the horizontal ground or at different distances from a sand slope with various slope angles, and the uplift bearing capacity and the failure mode of the anchors with different slope angles and different edge-distance ratios were obtained. The comparison results show that the error of the uplift bearing capacity from the laboratory tests and theoretical solutions is within 13%, and the failure mode is basically consistent, which verifies the rationality of the theoretical solution. Finally, the critical edge-distance ratio of the uplift strip anchor plates was examined. The analysis results show that the critical edge-distance ratio of the anchor increases with increase of the embedding depth and the initial cohesion, while decreases with the increase of the uniaxial tensile strength.