High precision detection of heavy metal ions is essential for environmental risk assessment. This study proposes a dual-mode approach for simultaneous detection of Pb 2+ by combining electrochemical and surface plasmon resonance (SPR) microfiber sensors. The dual-mode sensing strategy, as opposed to the single sensing modes (SPR sensing or electrochemical detection), not only exhibits the inherent characteristics of each sensing mode but also provides a significant amount of information during the electrochemical process. To increase sensitivity, indium tin oxide (ITO) with a gold film coating is employed as the working electrode. And the electrochemical reaction process can be monitored simultaneously because the SPR microfiber sensor is attached to the ITO electrode. Additionally, the microfiber sensor operates in the visible wavelength band, which has the benefits of cost-effectiveness, real-time sensing, and compact footprint, and is potentially employed in difficult-to-reach environments.