Abstract: In this paper, an application example of high-precision magnetic measurement, high-density electrical method and CSAMT method in the exploration of goaf in iron ore mines in Jinan City, Shandong Province is introduced. Firstly, an anomalous area of high-precision magnetic measuring circle is determined in the work area, then the goaf area is detected in an abnormal area using high-density and CSAMT method. The high-density electrical method is used in the range of 120 m depth, and the CSAMT method is used in the range of 100 ~ 200 m depth. The actual geological effects of the iron ore goaf exploration are summarized. The main research results are as follows: ① the intrusive interface of diorite is divided according to the magnetic and electrical differences of the formation. ② the distribution range of goaf is delineated more accurately. Later drilling verification is carried out and the results are more consistent with each other, which provides basic data for the development of comprehensive treatment work.