Sewage treatment mixed filter material, preparation method and application thereof, and sewage treatment system

The invention belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment mixed filter material, a preparation method and application thereof and a sewage treatment system. The volcanic rock in the sewage treatment mixed filter material provided by the invention can increase the content of oxygen ions in sewage, has sterilization and disinfection effects, and can balance the pH value of water, remove heavy metal ions and attach and grow microbial films, and the zeolite is an adsorbent with strong polarity, can efficiently adsorb ammonia nitrogen in the sewage, and can effectively purify the sewage. The adsorbed ammonia nitrogen is degraded into total nitrogen by nitrifying bacteria attached and grown on the surface of the zeolite through nitrification, and the nitrogen removal efficiency is high; calcium ions are slowly and enduringly released in the components of the aerated block particles, and the calcium ions react with inorganic salt phosphorus in sewage to generate