Water clarifierBHQ-205B isa mixture of organic polyamine and its derivatives and is applicable to high wax content oilfield. It is used for wastewater treatment systems of oilfields and water treatment systems of factories and can accelerate demulsification speed of emulsified oil in wastewater and can make oil droplets rapidly flocculate to become large and floated. Used in wastewater treatment systems of oilfields, it can increase oil removal rates of equipments such as coalescers, flotation machines and hydraulic cyclones.