Abstract: In order to accurately detect the underground distribution of burning rock and fissure water in open pit coal mine, a comprehensive electromagnetic detection method based on magnetic field intensity and resistivity is proposed, because different occurrence conditions groundwater has electromagnetic difference. Taking an open-pit coal mine in Xinjiang as an example, the boundary of the burnt rock is determined by the intensity parameter of magnetic anomaly, the low resistivity area at different depths is delineated by resistivity method combined with high-density electrical method and transient electromagnetic method, the distribution of burning rock water and fissure water is deduced separately according to geological conditions. The accuracy of the detection results is verified by ground drilling. The results show that the electromagnetic response of groundwater in the burning rock and fissure development area of open pit coal mine is obviously different, and the distribution range can be accurately delineated based on the two parameter comprehensive electromagnetic method according to the magnetic field intensity and resistivity.