A section of a dike in Guangdong Province were damaged with a total length of 175 m affected by typhoon in 2017, and the damage was quickly repaired after the disaster. In April 2018, the leakage occurred in the repaired dike section, which seriously threatened the dike safety. Geophysical prospecting method is the best technique for emergency detection of embankment seepage; however, it has the problem of nonunique solutions and many limitations. In order to solve the shortcomings of this single detection method so as to accurately detect embankment seepage, the high-density electrical method and ground penetrating radar integrated geophysical prospecting technology were used to detect the dangerous embankment section, and the field inspection and design data were combined for a comprehensive analysis. The results showed that high density resistivity method and ground penetrating radar integrated geophysical prospecting technology can effectively detect the seepage danger of embankment. It is speculated that there are two seepage channels in the dangerous section, located in pile number K0+618m and K0+642m, and the depth of the seepage interface of embankment is about 3 m.