The invention discloses a low-noise high-efficiency dehydrator, which comprises a machine body shell. A mounting base is arranged on one side of the top of the machine body shell. The mounting base isrotationally connected with a top cover through a damping rotating shaft. A KS02Y controller is arranged at the top of the mounting base. The bottom of the top cover is provided with a silencing board. The top of the top cover is provided with a handle. The interior of the machine body shell is fixedly connected with a sound insulation box through a fixing base. The sound insulation box comprisesa damping coating layer, a damping tube, a punching board, a fixing tube, a fixing frame, an inverted loudspeaker and a box body. The sound insulation box is arranged. The damping tube, the punchingboard, the fixing tube and the inverted loudspeaker are arranged in the sound insulation box. The punching board can reduce the vibration suffered by the sound insulation box. Meanwhile, the loudspeaker principle of positive amplification and negative minification is utilized by the inverted loudspeaker, so that the noise transmission can be reduced. Before the working of the dehydrator, the tap water can be injected into the damping tube through a water inlet tube. The vibration can be effectively transmitted through the damping tube.