The invention relates to a method for measuring resistivity in a single-pole measuring well. The method includes the following steps: (1) before use, an exploring pipe number recorder needs to be calibrated; (2) first electrical logging graduation is completed; (3) a single pole adopts hole diameter sidewall contact, the hole diameter sidewall contact is utilized to fully contact with a well wallas a measuring electrode, the measuring electrode is regards as an N electrode, and an external electrode is regarded as an M electrode; (4) the exploring pipe number include an acquisition panel, andthe acquisition panel includes an acquisition panel A hole, an acquisition panel B hole and an acquisition panel M1 hole; (5) resistivity data are stored in the exploring tube number recorder after measurement is completed; and (6) the obtained resistivity data are derived from the recorder to be analyzed and processed. The measuring method is simple, is high in efficiency and accuracy, and is convenient to measure.