Abstract: To address critical challenges in power cable installation under complex environments—including existing pipeline intersections, variable geological conditions, and narrow working spaces that lead to pipeline damage, sheath deterioration, and positioning deviations—we propose a three-phase collaborative construction process and quality control method integrating "precision detection, combined traction, and modular support systems." Pre-construction phase involves comprehensive ground surveys using geophones and pipeline detectors to establish 3D digital models. Path optimization is performed based on minimum safe clearance distance formulas, with stratified excavation plans (0.5–0.8m per layer in soft soil zones and 0.6–1.0m per layer in weathered rock formations). During construction, adjustable conveyor systems (with increased density before and after curves) are deployed alongside manual-assisted traction, with cable stress control calculated through traction force and lateral pressure analysis. Post-construction, modular prefabricated supports (with base elevation accuracy within ±2mm and clamp spacing of 1.2–1.5m) and layered backfill compaction (achieving ≥95% density) are implemented. Field applications demonstrate that the 3.8-km power cable project achieved backfill density of 95.5%–98.1%, maintained excellent cable insulation performance, and recorded zero operational failures within one year, significantly enhancing installation quality and construction efficiency.