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Traditional testing method for solenoid valve polarity of launch vehicles is often detected through "listening and touching", which has problems such as missed detection and false detection, inability to accurately interpret, and low testing efficiency. Therefore, the measurement and quantitative analysis of the magnetic leakage performance of typical attitude control solenoid valves were carried out to grasp the distribution of magnetic leakage fields in various parts of the valve body. A non-contact visual polarity detection system design method for electromagnetic valves was proposed, and the accuracy of polarity detection was ensured by using three redundant sensitive probes for sampling and programming design. Experimental testing was verified, it has achieved 100% detection of electromagnetic valve actions and accurate interpretation of timely sequence actions. This system was successfully applied on the testing process of large launch vehicles and has improved the automation testing level of launch vehicles.