Abstract: The freezing point is one of the most important and fundamental thermophysical parameters of liquid matters, and thus its accurate measurements is very essential for diverse practical applications. In this work, based on the dropwise freezing phenomenon occurring on solid surfaces, we designed and fabricated a freezing point measurement platform. Using this platform, we carried out experimental investigations on the phase-transition and heat transfer processes during the freezing of sessile water and salty water droplets, from which we measured the freezing point of these liquids, determined the time of the recalescent freezing and the bottom-to-top freezing at high temperature and also analyzed the amount of water that was solidified during recalescence. It was found that adding a small amount of salty into water can effectively delay the occurrence of its freezing, slow down the liquid solidification speed and also reduce the amount of frozen water in recalescent freezing. The development of this freezing point measurement platform would be very helpful for college students majoring in physics to deeply understand the phase-transition phenomena associated with the release/adsorption and transfer of the latent heat, guide them to combine theoretical knowledges from textbooks with experimental observations during their study, and improve students' comprehensive quality.