The invention relates to a multi-effect 
pollution removal purifying agent and a method for applying the same. The purifying agent is complexly formed by a strong oxidant, an effective adsorbent and an assistant medicament by a weight percentage of strong oxidant 10-80%, effective adsorbent 10-70% and assistant medicament 5-50%. The 
surface water treatment process of using multi-effect 
pollution removal purifying agent of the invention comparing with the common flocculants has the following advantages: effectively improving the 
turbidity removal ratio, increasing the flcos formation amount and 
alum blossom density for the difficult coagulated 
surface water, improving the deposition efficiency, oxidizing and removing the organic matters in the water, eliminating the chroma and 
odor caused by the 
pollution, increasing the 
effluent conventional indexes, obviously improving the indexes such as 
oxygen consumption and 
ammonia nitrogen, wherein the removal rate of 
oxygen consumption and 
ammonia nitrogen can reach 25-60%, the removal rate of small 
organic molecules, benzenes and 
phenols can reach more than 80%, playing an obvious roll for the 
algae inactivation of 
lake water and 
reservoir water which are serious eutrophic, improving the 
algae removal efficiency of the deposition and 
filtration technologies with an 
algae removal rate of 80-90%, improving the coagulation efficiency, reducing 20-30% of the common flocculant dosage, effectively adsorbing the codeposition heavy-
metal ion. The adding equipment of the invention is easy and convenient to use with little investment and fast effect.