Device for increasing yield of coal bed gas through cooperation of ultrasonic waves and hydraulic fracturing

A device for increasing the yield of coal bed gas through cooperation of ultrasonic waves and hydraulic fracturing comprises an ultrasonic generator and a crushing device arranged at the front end of the ultrasonic generator. A plurality of telescopic drill rods and a plurality of door bins are arranged on a machine body of the ultrasonic generator, and a rotary driving mechanism, a telescopic driving mechanism and a plurality of first ultrasonic transducers are arranged in the machine body; and the first ultrasonic transducer is mounted on the rotary driving mechanism through the telescopic driving mechanism. The telescopic drill rod is used for drilling into the surrounding coal seam, the whole ultrasonic generator can be fixed to the coal seam, the telescopic driving mechanism can drive the first ultrasonic transducer to stretch out of the ultrasonic generator and make direct contact with the coal seam, and energy loss is reduced; the first ultrasonic transducer can rotate around the axis of the ultrasonic