All-inorganic halide double perovskites are a class of environmental-friendly lead-free materials with the superior photoelectric properties and stabilities. These materials exhibit a great potential in solar cell applications, detectors and light-emitting diodes. This review mainly represented the crystal structures and photoelectric properties of all-inorganic halide double perovskites as well as their synthesis methods and applications. Meanwhile, This paper summarized the scientific bottlenecks of these inorganic materials and their corresponding devices, thus providing insightful guidelines for further improvement of their properties suitable for optoelectronic devices.