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The reported nutrient analyzers have not been successfully applied in the high pollution waters because of their defects, its sampling pipeline may easily be jammed. In order to address this problem, this paper puts forward a kind of monitoring system of jammed pipeline based on capacitive grating sensor. By using grating signal from capacitive grating sensor processed by sliding filter module into STM32 single chip, the system can detect the blocking-up in sampling pipeline and eliminate the blocking-up breakdowns to ensure steady running by using membrane replacement device to replace membrane. Experiment result and test of prototype show that the method of capacitive grating measurement is proved correct in monitoring of jammed pipeline. This new method could provide a new measurement for online monitoring of jammed smaller diameter pipeline.