The magnetic and photoelectric properties of Mn-doped LN-ZnTiO3 were calculated through density functional theory. The calculated results show that Mn-doped LN-ZnTiO3 tends to occupy the Zn site, which forms a stable 3d5 electronic configuration. Mn instead of Zn doping in LN-ZnTiO3 can provide with a large local magnetic moment of about 5 μB. At the same time, an obvious acceptor energy level of Mn-3d and O-2p orbitals are formed near the top of the valence band, which reduces the band gap and promotes the absorption of visible light. Mn doping in LN-ZnTiO3 could achieve a large local magnetic moment and the characteristics of p-type semiconductor, which expands the application of materials in magnetics and visible light absorption.