Perovskite/silicon tandem solar cells, by combining perovskite as top absorber material and crystalline silicon as bottom absorber material, can expand and enhances the utilization of solar spectrum. Therefore, such a tandem structure shows great potential to break through the Shockley–Queisser (SQ) limit of 31–33 % for single-junction (SJ) solar cells and be considered as one of the most promising approaches to achieve higher performance in photoelectric conversion of solar cells. In this paper, the enhancement of spectral response and energy conversion efficiency of perovskite/silicon tandem solar cells depend on Au、Ag、Cu、Al nanosphere are studied by using finite difference time domain method (FDTD) and rigorous coupled-wave analysis (RCWA). The results show that, due to the introduction of metal nanosphere, the transmittance of photons propagated into active material are be promoted significantly. Therefore, the cell devices achieved an apparent increase in total absorbance and quantum efficiency. The observed weighted average transmittance and energy conversion efficiency are increased from 73.16% and 23.09% to 79.15% and 24.97%, respectively, with an 8.14% improvement for the perovskite/silicon tandem solar cells coated with the optimized Al nanosphere.