To address the current issues of low-power line-structured light and the difficulty in achieving long-distance detection, this study proposes a biconic Zernike lens composed of aspherical and free-form surfaces. The lens is designed to shape a 5 W laser source into line-structured light. Initial parameters for the fast-axis collimation surface are determined using the extremum optical path law and the aspherical standard equation. By analyzing the slow-axis divergence angle and the mapping relationship to the target plane, combined with Snell's law, the free-form curve equation is derived to establish the initial structure of the slow-axis beam-expanding surface, thereby obtaining the preliminary parameters of the shaping lens. Optical simulation results demonstrate the following performance: The fast-axis divergence angle is compressed from 49° to 0.942 mrad. The slow-axis flat-top field angle reaches 43.6°, with an optical energy utilization rate of 86.4% and uniformity of 96.9%. At a projection distance of 2 000 mm, the system generates uniform line-structured light measuring 1.9 mm × 1 600 mm, delivering an output power of 4.3 W. It increases the projection distance by 3.3~29.4 times compared with the existing line-structured light (light energy of 5~400 mW), and provides an effective method for realizing long-distance detection.