Vacuum dryer not requiring vacuum pump

A vacuum dryer not requiring a vacuum pump, the vacuum dryer comprising:

• a drying chamber which has a sealed inner space formed therein and has a drying rack installed therein, the drying chamber being provided with a steam inlet formed inside of one side surface thereof to be interlocked with an exhaust valve, the exhaust valve being provided on an outside of the other side surface of the drying chamber to be interlocked with the steam inlet;
• a steam generator which is positioned outside the drying chamber and is provided with a water tank, and is connected to the steam inlet;
• and
• a heat pump which is provided to be interlocked with an inside and an outside of the drying chamber, and forms a high-temperature area and a low-temperature area in the drying chamber,
• wherein, when the steam generator saturates the inside of the drying chamber with steam, the heat pump reduces a volume of the steam by liquefying or sublimating the steam by reducing an internal temperature of the drying chamber, thereby creating a vacuum state inside the drying chamber.