The limit load in stability problems in soils is often influenced by the inherent anisotropy. Accordingly, it can be more or less misestimated if an anisotropic soil is simply assumed as being isotropic. In this research, the static and seismic active and passive earth pressures of vertical retaining walls in anisotropic sands are investigated by the use of the lower bound limit analysis method in conjunction with the finite elements and linear programming optimization technique. In this regard, the effect of friction angle anisotropy on the limit pressure was considered. To do so, an iterative procedure was made to incorporate the effect of soil anisotropy. In the proposed iterative procedure, the friction angle was incrementally updated after each iteration. After sufficient iterations, a converged solution and a consistent field of friction angle is achieved which satisfy the convergence criteria of the direction of the major principal stresses and the limit load, as well as a stable stress field. It is worth mentioning that the pseudo-static approach was considered in order to apply the seismic condition. The results were compared with those found in the literature and some design charts were developed. Findings indicate that the passive earth pressure coefficient is much more influenced by the degree of anisotropy than the active earth pressure coefficient.