Compound type water purifying agent for purifying sewage and preparation method thereof

The invention discloses a compound type water purifying agent for purifying sewage and a preparation method thereof. The compound type water purifying agent is prepared from the following ingredientsof activated calcium carbonate, polyaluminum ferric chloride, calcium chloride, montmorillonite powder, polyacrylamide and activated aluminum oxide. The compound type water purifying agent disclosed by the invention is prepared by formula improvement. According to the compound type water purifying agent, the ingredients are compounded; thus, a water treating function of the water purifying agent is enriched, pollutants in the sewage can be quickly flocculated and precipitated by the water purifying agent, sewage color can be remarkably improved, ammonia nitrogen and heavy metal pollutants in the sewage can be further effectively removed, a water purifying effect is good, and use cost is low. Compounding among the ingredients of the compound type water purifying agent further can generate asynergistic effect, so th