Utilizing high-precision sealing technology, the ends of the steel-plastic composite pressure pipes are fully wrapped with polyethylene plastic, ensuring that the steel strip pressure layer does not come into contact with air or other media. This maintains the overall anti-corrosion effect unaffected by the ends, and the insulating performance of the entire pipe is equivalent to that of pure plastic pipes. For urban power grids, the electrical insulation performance of the PSP protective tubes exceeds that of power cables, making them safer to use.