Abstract: The intelligent drainage device, a new protective equipment against stray current interference, integrates a micro cathodic protection power supply channel, AC and DC drainage channels, a control unit for automatic adjustment of drainage parameters, and a real-time monitoring and remote data transmission unit. To verify the applicability of the intelligent drainage device, a method combining laboratory simulation tests and field tests was used to conduct a comparative study on its applicability under different stray current interference scenarios. The research results indicates that: (1) The device is suitable for protection against AC and DC stray current interference. (2) The laying method and material type of the drainage ground bed have minimal impact on protection effect. (3) The device features automatic adjustment of drainage parameters, integration of drainage and protection, real-time monitoring, and remote data transmission, effectively addressing complex AC and DC stray current interference. (4) The device exhibits particularly remarkable automatic regulation of drainage and protection capabilities in complex environments with mixed AC and DC stray currents, as well as in dynamic DC stray current interference scenarios. In conclusion, the research findings provide valuable insights for the application of intelligent drainage devices in protection against stray current interference.