Assembled power eccentric foundation is a new type of foundation, which is designed and calculated according to existing standards, but the influence of horizontal force and soil on foundation design has not been discussed. To study the pull-out performance of this new assembled eccentric foundation, the ultimate pull-out capacity, the law of internal force transfer, and the stress of a single component of the foundation are analyzed under progressive loading of oblique loads by theoretical calculation and finite element simulation. To verify the correctness of the results, an indoor pull-up test of a scale model is designed. Based on the comparison of the results, it is found that the whole foundation do not undergo uplift failure. The downward transmitted force gradually become uniform with the increase of the depth of the foundation. The simplified calculation results of a single component are in good agreement with the experimental and the simulation results. The analysis of the internal force transfer law of foundation and the stress of individual member show that the overall uplift design method in the current code is still applicable to this new type of foundation. Horizontal force and soil have certain influence on the uplift of foundation, but the uplift resistance can be neglected. Thus, the simplified calculation method of single member is feasible.