Wet soil layer in-situ water taking device and water taking method

The invention provides a wet soil layer in-situ water taking device and a water taking method. An ultrasonic device is introduced in the negative pressure water taking process, soil particles and sorption water generate vibration and periodic pressure change under the action of ultrasonic waves, shear acting force is added to the sorption water, the water adsorption capacity is weakened, the rapid desorption effect is achieved, and due to the vibration of the soil particles and the change of local pressure, the adsorption capacity of the water is reduced. The effect of local compaction or local stretching is generated, the size and connectivity of pores are enlarged, and seepage channels of water are increased. The ultrasonic transducer is tightly connected with the soil layer through the acoustic coupling pipe, so that the propagation distance of ultrasonic waves in the soil is increased, the influence range of the ultrasonic waves is large, and the water taking efficiency is greatly improved; the water coll