The invention relates to the field of voltage data measurement methods, and provides a voltage monitoring and management system data deepening analysis method comprising the following steps that the corresponding index analysis diagram of the voltage detection data and the data list are displayed according to the type of the voltage monitoring point and the voltage grade; different types of voltage monitoring data are acquired and displayed; the unqualified voltage data discovered in acquisition are marked and listed to the abnormal data series; and the qualified voltage rate is calculated according to the specific value of the qualified voltage data to the total voltage data. According to the method, inquiring and statistics of the voltage situation of different voltage grades and different regions can be realized and the line or the transformer area of which the qualified voltage rate is not up to the standard is alarmed. According to the method, inquiring and statistics of the situation of different voltage grades and different regions can be realized and the measuring points of which the qualified voltage rate is not up to the standard are alarmed so that the voltage situationof all the lines and the transformers areas of the power grid can be comprehensively monitored.