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The present invention relates to a polyaluminium chlorine-based inorganic coagulant having high alkalinity. More particularly, provided is a method to prepare a polyaluminium chlorine-based inorganic coagulant having high alkalinity by having a reaction of polyaluminium, a strong basifying agent, and rare earth resources which are natural minerals, wherein polyaluminium has low alkalinity and can be obtained from a reaction between aluminium hydroxide and hydrochloric acid.COPYRIGHT KIPO 2016