The dosing device is a complete set of equipment integrating dosing, stirring and dissolving, mixing and diluting, storing chemical liquid, conveying fluid, automatic monitoring and control. It is widely used in various dosing systems and wastewater treatment systems in the fields of raw water of power plants, boiler feed water, oilfield ground dehydration treatment, petrochemical and other fields. Coagulants, phosphates, ammonia liquid, lime water, water quality stabilizers, scale inhibitors, fungicides, etc. The upper dissolving stirring tank serves as a functional unit for dissolving powder, diluting and mixing medicines, etc., and is connected to the lower storage tank through a ball valve or an electric valve. It can effectively control the uniformity of solution concentration, prevent impurity waste from entering the dosing system, and ensure the effectiveness and reliability of the system work.