The invention relates to a monitoring device data flow assessment and noise cancellation method, which comprises the following steps: firstly, inputting data, and obtaining the correlation between parameters to be analyzed according to a correlation analysis method; adopting different countermeasures according to different data flow forms and types; for two sequences with relatively strong correlation, if the two sequences produce mutations at the same time, the mutational volume being not wrong data according to the principle of association rules, and detection points being not processed; if one of the sequences produces a mutation, the mutational volume being regarded as the wrong data, and the detection points being corrected; for sequences having a weak correlation with other sequences, the mutational volume or separated data being regarded as wrong data, and the detection points being corrected. The monitoring device data flow assessment and noise cancellation method provided by the invention has the advantages of realizing the monitoring device data flow assessment and noise cancellation, conveniently gasping the state of a monitoring device, and timely making the countermeasures.