A low-temperature vacuum cooking device and a cooking appliance including low-temperature vacuum cooking device are provided. The cooking appliance may include a housing including a container mount and a vacuum-packing module mount provided adjacent to each other, a first container having a space to accommodate a liquid therein, the first container being configured to be coupled with the container mount, a heater that heats the liquid accommodated in the first container, a vacuum pressure generator installed on the vacuum-packing module mount to suction air inside a food packing bag, a sealer installed adjacent to the vacuum pressure generator that heats the food packing bag in order to seal it, a cover rotatably installed on the housing to cover or open the first container and the vacuum pressure generator, and a high-temperature cooking unit including a top plate and a high-temperature heater provided at a lower portion of the top plate.