The invention relates to an analysis method for forecasting a periodic lattice-material yield surface. According to the analysis method, the coupling effect of the internal-structure axial force and bending moment when a material is actually stressed is considered, a yield condition of periodic lattice-material representative volume element (RVE) is obtained through theoretical derivation, and then through finite element analysis software, mass total calculation is achieved through programming. In post-processing, the calculating result is obtained in the mode that a yield point is automatically identified and extracted, the calculating result and the theoretical result are jointly visualized, and are compared mutually and verified, the accuracy of the result is guaranteed, and therefore forecasting of the strength performance of the periodic lattice material is achieved.