The application provides a contact resistance measurement method and device for measuring contact resistances at a contact port of preformed armor rods and a ground wire, and relates to the technicalfield of the contact resistance measurement. The contact resistance measurement method comprises the following steps: acquiring two kinds of AC current in different frequencies of a contact resistancerate satisfying a preset requirement; loading two kinds of AC current in different frequencies at the contact port of the preformed armor rods and the ground wire, respectively measuring a first voltage and a second voltage at the preformed armor rod and the ground wire contact port, and obtaining the contact resistance at the contact port of the preformed armor rods and the ground wire accordingto the first voltage and the second voltage. By using the contact resistance measurement method and device provided by the invention, the AC contact resistance can be directly measured, and the errorbetween a measurement value and an actual value of the contact resistance is effectively reduced.