This technology belongs to the field of wastewater treatment. High-salinity pharmaceutical wastewater is sequentially introduced into a coagulation sedimentation tank, an anaerobic bioreactor filled with iron filings and granular activated carbon, and a dynamic membrane treatment system using photosynthetic bacteria as the inoculum for pretreatment by coagulation sedimentation, anaerobic treatment, and aerobic advanced treatment. This approach not only enhances the biochemical properties of the wastewater, improves the treatment efficiency, and achieves compliant discharge but also has a simple process and low energy consumption. Technical advantages include: 1. The overall process of the technology is simple and highly coupled. 2. The uniform distribution of iron filings and granular activated carbon in the anaerobic sludge within the anaerobic bioreactor is conducive to the enrichment of characteristic microorganisms, thereby promoting the electron transfer efficiency in the anaerobic reaction process, enhancing the biochemical properties of the wastewater, and improving the treatment efficiency. 3. Using high-salt-resistant photosynthetic bacteria screened from seawater as the inoculum in the dynamic membrane treatment system. It can effectively improve the treatment efficiency of wastewater, which is conducive to the deep treatment of wastewater. The dynamic membrane is used for the solid-liquid separation of photosynthetic bacteria, with a long operating cycle and controllable membrane pollution.