The invention provides a method and device for detecting and processing a reverse power supply circuit. The method comprises the following steps: detecting whether a communication quality parameter of the reverse power supply circuit exceeds a preset range; when the detection result is positive, analyzing whether the communication quality parameter of the reverse power supply circuit exceeds the preset range is caused by power supply noise; and when the analysis result is positive, stopping the power supply of the reverse power supply circuit or keeping a power supply stop state of the reverse power supply circuit, and reporting the analysis result and/or a processing result of the reverse power supply circuit to a network management system. By adopting the method and device provided by the invention, the power supply noise can be identified and detected, and the power supply of the reverse power supply circuit containing the power supply noise is stopped to avoid the influence of the power supply noise in time, so that the problem that the normal work of the present circuit and other circuits will be influenced by the reverse power supply circuit containing the power supply noise is solved, the anti-interference ability of the system is improved, and the robustness of the system is enhanced.