Optical thin films of MgF2 were successfully fabricated by pulsed laser deposition technique. The morphology and optical properties were investigated. The transmittance was 60%-80% in the visible light range, and more than 90% in the infrared range. The XPS showed the atom ratio of F: Mg in the obtained film was 1.9-2.1, very close to the bulk material. The refractive index of MgF2 thin film was -1.39 resulted from K-K calculation, also close to the value of 1.38 of the bulk MgF2.