Energy-saving dryer

An energy-saving dryer is disclosed, which comprises: a main body having a containing tank and an opening connected to the containing tank; a lid which can be opened to associate with the lid of main body in an air-tight fashion to seal the opening of containing tank, so as to prevent the gas in the containing tank from leaking out to the exterior of the main body; a vacuum pump connected to a pipe conduit. The pipe conduit is associated with the main body and connected to the containing tank for extracting the gas or liquid in the containing tank; a refrigerator connected to a condenser tube; the condenser tube is associated with the main body and is disposed inside the containing tank to cool down the gaseous water molecule and reduce its volume, and to condense the gaseous water molecule into liquid droplet or solid ice to adhere onto the wall of the condenser tube, so as to accelerate the drying speed of the dried object, and achieve energy-saving effect.