The invention provides an apparatus for detecting the iron ion stabilization capacity of an ion stabilizer. The apparatus comprises a reaction chamber, a standard solution chamber and an auxiliary liquid-adding chamber, wherein the lower end of the standard solution chamber is communicated to the upper end of the reaction chamber through a left conduction pipe, the lower end of the auxiliary liquid-adding chamber is communicated to the upper end of the reaction chamber through a right conduction pipe, the left conduction pipe is provided with a left valve, the right conduction pipe is providedwith a right valve, the left conduction pipe and the right conduction pipe are respectively provided with a flow meter, the reaction chamber is connected to a pH system, and is provided with a stirrer, the stirrer comprises a motor and a stirring paddle, the stirring paddle is placed inside the reaction chamber, the motor is placed outside the reaction chamber, the motor is connected to the stirring paddle in the reaction chamber through a rotation shaft, and the reaction chamber is installed in a temperature control system. According to the present invention, with the apparatus, the experimental operation steps are substantially simplified, the experimental conditions are improved, the experiment process is precisely controlled, the accuracy of the detection is improved, the experimentalprocess is smooth, and the operation is simple.