The invention discloses a detection method for 
power quality monitoring data. The method includes the following steps that A, the 
power quality monitoring data are acquired from a 
power quality monitoring terminal, and one or more steps of the step B, the step C and the step D are executed; B, a channel 
label is acquired from the power 
quality monitoring data, and the channel 
label is compared with a prestored standard channel 
label; C, a sequence property is acquired from the power 
quality monitoring data, and the sequence property is compared with a prestored 
standard sequence property; D, sequential value error detection is conducted on the power 
quality monitoring data; E, the comparison and / or detection results of one or more steps of the step B, the step C and the step D are fed back to a power quality analysis 
server, data which meet the on-line 
monitoring system requirement are analyzed and then stored into a foundation 
database, serving as advanced calculation basic data, the data which cannot meet the requirement are fed back to the monitoring terminal, and a PQDIF file is generated again according to the 
standard definition. By the adoption of the method, the detection data of the monitoring terminal can be detected quickly, and screening of the monitoring terminal can be simplified.