In order to solve the problems such as inconvenient mixing and imprecise proportioning of emulsion in coal mine,an emulsion proportioning device based on electromagnetic proportional technology was designed by using TRIZ innovative theory.After establishing the problem model,the functional analysis method was used to analyze the system and the main contradictions of the system were derived.The two main physical contradictions were solved by the principle of separation and the scientific effect library,and the contradiction matrix was used to solve the newly generated technical contradictions,and finally the implementation was improved.A solenoid valve was used to control the flow of oil into the proportioning motor and change the speed of the proportioning pump accordingly to achieve the purpose of changing the flow of oil.A concentration sensor was added to achieve concentration feedback and realize the automatic proportioning and precise proportioning of emulsion.In actual production and application,the scheme increases the reliability of the emulsion ratio,reduces the labor intensity of workers,and decreases the oil cost and environmental pollution caused by the excessive concentration of the emulsion.