<p>SrFe₁₂O₁₉-based sensors face challenges related to synthesis control, structural stability, and performance optimization, which hinder their widespread application. The size, shape, crystallinity, and functional behaviour of SrFe₁₂O₁₉ particles are all modified by synthesis techniques, which directly affect sensor efficiency. Further, dopant inclusion (Co, Zn, Ni, and rare-earth elements) and nanostructuring are essential aspects that improve sensor stability, sensitivity, and selectivity; nevertheless, additional research is needed to determine their precise contributions. Several synthesis techniques, such as sol-gel, co-precipitation, hydrothermal, solid-state, and microwave-assisted processes, are critically examined in this review and connected to the structural and magnetic characteristics that control sensor performance. It also highlights recent developments in SrFe₁₂O₁₉-based gas, humidity, biosensors, and electromagnetic sensors while pointing out long-term stability and temperature sensitivity issues. Furthermore, optimization techniques, such as hybrid sensor designs, composite constructions, and material modifications, are investigated to improve reaction time and reliability. This review offers a thorough resource on the connection between synthesis techniques, material characteristics, and sensor efficiency for researchers working on next-generation ferrite-based sensors.</p>