A food defrosting tray includes a tray body on which a frozen food is adapted to be placed. The tray body is made of metal and includes a plurality of heat transfer pieces spaced in parallel. The food defrosting tray further includes two conjunction members which engage with first and second ends of the heat transfer pieces respectively. Each conjunction member includes a plurality of sheaths made of a pliable but strong material. Two adjacent sheaths are connected to each other through a collapsible portion so that the tray body and the conjunction members are collapsible and can be rolled up for better contact with a food material and preferable defrosting capability. Moreover, the foldable tray body allows the food defrosting tray to be rolled up easily for effective storage.