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The dielectric and magnetic properties of Sr(Fe1/2Ta1/2)O3 complex perovskite ceramics were systematically investigated together with the structure. The X-ray powder diffraction analysis confirmed a B-site disordered orthorhombic structure in space group Pbnm. Only one broadened dielectric peak with strong frequency dispersion was observed in the present ceramics, which was significantly different from that for the analogue Ba(Fe1/2Nb1/2)O3 and Ba(Fe1/2Ta1/2)O3. The strong dependence of sample thickness and electrode material indicated that the dielectric relaxation behavior at lower frequency was due to the interface effects. The present ceramics were spin glass state with slight ferromagnetic behavior below the Néel temperature (20 K). The co-presence of Fe3+ and Fe2+ was confirmed by the μeff value.