The ability to accurately detect metal particles in the electrolyte solution is of great significance to food and drug safety. In the field of food and medicine, metal detection technology is mainly based on the principle of electromagnetic induction. When the electromagnetic method is used for metal detection, the output of free conductive ions under the metal detection system is similar to that of metal particles. When metal particles are in an electrolyte solution, free conductive ions will have a huge impact on the detection of metal particles. This paper studies the detection of tiny metal particles in the electrolyte solution. Using a balanced double-coil metal detection structure, a metal detection system for the detection of tiny metal particles in the production of food and medicine is developed, and the system is used The standard metal sample detection experiment under the electrolyte solution environment was carried out. Through experiments, it is found that: "In the phase component waveform of the output signal after the electrolyte solution and metal particles pass through the detection system at the same time, the effect of the metal particles on the phase component waveform is obvious and stable, but the strength of the effect decreases with the size of the metal particles. The gradual decrease is related to the position of the metal particles in the electrolyte solution. According to the change of the phase component waveform, there is the possibility of distinguishing the metal particles from the electrolyte solution." Due to the relatively complex waveform shape of the phase component and the weaker influence of small volume metals, real-time detection algorithms such as the curve length integral method and the double-sided cumulative area method are used to detect the influence of metal particles in the phase component, and the above-mentioned metal detection Realized on the system.