In this present work, series of Mg1-xSrxFe2O4 (x = 0.05-0.25) nanoparticles were prepared by simple chemical method and their properties were evaluated with different characterization techniques. Transmission Electron Microscope (TEM) and powder X-ray diffraction (XRD) results were strong evident for the formation of spinel structured crystalline nanoferrite. TEM and Selected Area Electron Diffraction (SAED) visible evidence for the formation of high crystalline nanoparticles. Synthesized ferrite nano particles exhibits normal dielectric behavior which is modified with different Sr2+ content. The presence of grain and grain boundary in ferrite nanoparticles were identified in TEM and impedance analysis and their electrical response were controlled by different Sr composition. The Magnetic properties were measured by vibrating sample magnetometer (VSM), which showed that the synthesized particles were in ferrimagnetic state. On the substitution of comparatively large ionic size Sr2+ in spinel structure Mg ferrite, we observed interesting electrical and magnetic properties of ferrite particles. (C) 2018 Elsevier B.V. All rights reserved.