In this work, the electronic band structures, total density of state, partial density of state, and optical properties were investigated using the ﬁrst principle method for SnWO4 via generalized gradient approximation (GGA) based on the Perdew–Burke–Ernzerhof (PBE0). The estimated band gap was found to be 0.557 eV which is supported for good semiconductor. The density of states and partial density of the states were simulated for evaluating the nature of 5s, 4d 5p for Sn, 6s, 4f, 5d for W and 2s, 2p for O atom for SnWO4. The optical properties for instance, conductivity, dielectric function, and the loss function were calculated. The main goal of this research study was to determine the Fe doping activity on the electronics structure and optical properties by 8%, and the band gap was recorded in 0.0 eV, showing as a superconductor. Regarding the optical properties, the loss function was decreased after doping.