Abstract: In order to study the coal-excavating effect of coal body under the action of high-pressure water,the contiguous seams in Songhe coal mine of Guizhou Province was taken as the research object. The electromagnetic radiation technology was used to monitor the number of electromagnetic radiation signal pulses in different coal seams and different moments during hydraulic punching. According to the change of parameters such as energy value and other parameters at different time, the law of coal body fracture under certain water pressure was analyzed according to the change of electromagnetic radiation parameters. The results show that during the hydraulic punching process, the more severe the coal fracture is, the more obvious the sudden change of the electromagnetic radiation signal. The electromagnetic radiation signal during hydraulic punch conforms to Hurst Statistics Law. According to the intensity of electromagnetic radiation signal, the process of coal mass failure can be divided into three stages: micro-fracture stage, the stable crushing stage and the abnormal crushing stage. The electromagnetic radiation monitoring technology can be used to monitor the internal coal creep during the process of hydraulic punching and coal breaking. The research results provide theoretical support for monitoring electromagnetic radiation signals and evaluating the effect of hydraulic punching, and have certain guiding significance for hydraulic punching effect analysis.