The invention discloses a safe and efficient adjustable defogging device, which comprises a guide wheel, a box body, an air inlet pipe, a gas flow rate measuring instrument, a defogging pipe, a corrugated plate, a pull rod, a handle, a scale, an LED lamp, a return pipe and an air outlet pipe , the bottom surface of the box body is provided with a guide wheel, the bottom side of the box body is provided with an air intake pipe, the air intake pipe is connected to the demisting pipeline, the demisting pipeline is arranged in the box body, and a gas flow rate measuring instrument is installed on the air intake pipe, There are transparent glass plates on the side wall of the box, multiple corrugated plates in the defogging pipe, corrugated strips on both sides of the corrugated strips, and an anti-corrosion film on the corrugated strips. There are blocking blocks on the top, and the two blocking blocks are respectively arranged on the inner and outer sides of the side wall of the box. There is a scale on the pull rod, a timer on the side wall of the box, and an LED light in the box. The outlet end of the pipeline is connected with the outlet pipe. The invention improves working efficiency, has simple structure, is convenient to use, and is beneficial to popularization.