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In order to solve the problem that the existing seed performance monitoring method is not available for the belt-type high-speed seed guide device, and the seed belt carrier and seed particle cannot be distinguished during the seed casting process, making seed performance difficult to monitor, a monitoring method and system for a belt device based on infrared sensors was studied and designed. The two-sided pulse comparison method was proposed, and the hardware circuit and software process of the monitoring module for the belt-type high-speed guide device were independently designed. At the same time, a belt-speed device monitoring algorithm (bilateral pulse value analysis and energy masking smoothing algorithm, BPV-EMSA) was developed. It reduced the noise and random fluctuations of the original pulse, made the data smoother and more stable, and highlighted the main trends and patterns of the data, while suppressed transient pulse interference and improved the data interpretability and analysis accuracy. The accuracy test results of the monitoring system showed that the monitoring accuracy of the designed belt-type high-speed seed guide device monitoring system was above 95.9% at different operating speeds, with the highest accuracy of 97.65% and the lowest of 95.99%, proving that the system can accurately collect the pulse changes of seed particles through the monitoring point. The results of performance evaluation test of monitoring system showed that the average monitoring error of seeding qualification rate was 2.00 percentage points, the average monitoring error of seeding missed seeding rate was 1.45 percentage points, and the average monitoring error of seeding reseeding rate was 0.56 percentage points. The relative error of seeding pass rate was not more than 2.23 percentage points, the relative error of seeding missed seeding rate was not more than 1.78 percentage points, and the relative error of seeding reseeding rate was not more than 1.00 percentage points. This monitoring method can accurately monitor the seed guide performance of the belt type high-speed seed guide device.