We synthesized a silver iron oxyfluoride AgFeOF2 by using a high-pressure reaction. Synchrotron X-ray and neutron diffraction, X-ray absorption, and Fe-57 Miissbauer spectroscopy indicate that AgFeOF2 crystallizes in the ideal perovskite structure with iron in a trivalent state, although electron microscopy revealed weak super-reflections. A possible partial ordering in the FeO2F4 octahedron is inferred from Mossbauer 600 spectroscopy. The synthesis of the fluorine-rich sample offers an opportunity to study a composition-property relation in AFe(III)O(3-n)F(n) (n = 0, 1, and 2). AgFeOF2 exhibits a G-type antiferromagnetic ordering below T-N approximate to 480 K, which is much lower than the n = 0 and 1 cases, suggesting a weaker superexchange interaction between Fe moments via F 2p orbitals (vs O 2p orbitals).