Terrestrial and aerial simultaneous frequency-domain electromagnetic detection system, divided into time-domain electromagnetic method and frequency-domain electromagnetic method. The system consists of three parts: ground-based transmission system, aerial drone receiving system, and data processing program. This system employs a high-power ground-based transmitter to output time and frequency-domain current to a grounded long wire source, generating a wide-range induced field. Simultaneously, the time and frequency-domain electromagnetic collection devices are mounted on an aerial drone to capture underground induced electromagnetic signals. Underground electrical structure information is obtained through apparent resistivity imaging.