Abstract: The inspiration for imaging using the underwater active electric field amplitude method comes from the biological mechanism where weakly electric fish actively emit electrical signals to detect the surrounding environment. Current active underwater imaging techniques still have certain shortcomings in complex, dark underwater environments. Hence, a solution has been proposed, utilizing the principle of the underwater active electric field to identify and image the complex shapes of short-range target objects. To address previous issues such as limited coverage of electrode arrays, low imaging resolution, high costs due to the large number of electrodes needed for imaging larger objects, and the lack of examples for imaging objects with complex geometric features, a platform was designed featuring a linear electrode array that continuously moves, scans, and collects data for amplitude imaging. This platform is used to image experimental objects of various sizes, materials, and complex shapes, and to compare results. It also explores how to extract the position and area information of objects in the imaging pictures by analyzing the extreme points of the amplitude integral slope curves in both horizontal and vertical directions. Experimental results confirm the effectiveness of the amplitude imaging method based on the active electric field principle using a linear electrode array motion scan. Compared to traditional active electric field imaging methods, this proposed method not only significantly reduces hardware costs but also greatly enhances imaging efficiency and resolution. Additionally, this approach provides a practical solution for the further engineering application of active electric field imaging technology. This approach significantly optimizes the imaging process of underwater objects, demonstrating its potential applications in complex aquatic environments.