Coupling cable for ground cross-hole resistivity CT detection

The invention provides a coupling cable for ground cross-hole resistivity CT detection, which comprises a detection cable and a coupling agent tube. The detection cable and the coupling agent tube are arranged side by side. A plurality of electrode holders sleeve and are connected in series to the detection cable and the coupling agent tube, coupling electrodes are arranged in the electrode holders, and the detection cable is electrically connected with the coupling electrodes Coupling agent holes are formed in the electrode holders or the coupling electrodes, and the coupling agent tube is communicated with the coupling agent holes. Before use, according to actual working conditions, a drilling machine drills drill holes with the apertures slightly larger than the diameters of the electrode holders, then a cable is unfolded and placed into the drill holes, a water coupling agent is replaced with a foam coupling agent, the foam coupling agent is conveyed into the drill holes through the coupling agent tube, t