The invention discLoses a water injecting and draining type uLtrasound coaLbed gas desorption and extraction device. The device is composed of a protecting pipe heads, a pipe body structure and an uLtrasound device. The device is characterized in that the protecting pipe head is a conicaL steeL body, and the protecting pipe heads are weLded to the tops of a water pumping pipe, a water injecting pipe and an extracting pipe; the pipe body structure is composed of the water pumping pipe, the water injecting pipe, the extracting pipe, nozzLes, an extracting hoLe and rotary threaded ports, the water pumping pipe is embedded in the water injecting pipe and then integraLLy embedded in the extracting pipe, the water injecting pipe is connected with the extracting pipe through a pLuraLity of nozzLes, a pLuraLity of extracting hoLes are formed in the part outside the extracting pipe, the rear ends of the water pumping pipe, the water injecting pipe and the extracting pipe are provided with the rotary threaded ports; an uLtrasound generating device is instaLLed at the Lower end portion of the pipe body structure, uLtrasonic transducers are embedded on the nozzLes, and an uLtrasonic probe is weLded to the outer side of the extracting pipe.