The invention relates to a method for the fault discrimination, checking and fault influence range analysis of a power grid, and the method comprises the following steps: 1, building a discriminationinformation data model; 2, building a one-to-one mapping relation between operation sides and production management sides for all power grid equipment, so as to achieve the mutual recognition; 3, obtaining original event information from different fault data sources, carrying out the different initial screening of the original event information according to the difference of the data sources, carrying out the discrimination of the original event information meeting a condition through the correlation event information in a set time period before and after an original event according to a corresponding fault discrimination rule, and classifying the original event information meeting the condition into a suspected fault event set; 4, carrying out the manual checking of the suspected fault event set, determining a fault discrimination result, analyzing the fault influence range through a primary wiring topology of the power grid if the event is determined to be a fault, and representing an analysis result. Compared with the prior art, the method employs multiple pieces of data information and multiple criteria for joint discrimination, and improves the fault discrimination accuracy and reliability.