The present invention discloses a power distribution network zone area low-voltage sudden fault determination method based on a classification technology. The method comprises the steps of obtaining the correlated data of the power grid condition and the property of a reaction zone area; selecting the useful characteristics of the correlated data; constructing a classifier and a strong classifier; determining whether a sudden fault occurs. The method disclosed by the present invention can determine the reason of the sudden fault rapidly from the angle of the power grid maintenance and overhaul, enables the maintenance personnel to be sent to the sites to overhaul, and has the important guidance significance for the daily overhaul work of the power grid.