The study investigates the unique characteristics of salty droplet icing, which differs significantly from pure water droplet icing. The research reveals that salty droplet freezing is governed by salt rejection and ice crystal growth, leading to a freezing dynamics distinct from pure water. A brine film forms on top of frozen salty droplets, and the freezing duration is defined based on temperature measurements and optical imaging. The morphology of frozen salty droplets is influenced by ice crystals that sprout from the bottom of the brine film, piercing through it and continuing to grow in the air. This ice sprouting phenomenon is controlled by condensation at the brine film's free interface, as validated through molecular dynamics simulations. The findings provide valuable insights into the physics of salty droplet icing, which is crucial for applications such as freeze desalination and marine anti-icing.The study investigates the unique characteristics of salty droplet icing, which differs significantly from pure water droplet icing. The research reveals that salty droplet freezing is governed by salt rejection and ice crystal growth, leading to a freezing dynamics distinct from pure water. A brine film forms on top of frozen salty droplets, and the freezing duration is defined based on temperature measurements and optical imaging. The morphology of frozen salty droplets is influenced by ice crystals that sprout from the bottom of the brine film, piercing through it and continuing to grow in the air. This ice sprouting phenomenon is controlled by condensation at the brine film's free interface, as validated through molecular dynamics simulations. The findings provide valuable insights into the physics of salty droplet icing, which is crucial for applications such as freeze desalination and marine anti-icing.