The invention discloses a node disturbance power transfer distribution balance degree analyzing method. The method comprises the steps of conducting load flow calculation on an electric system when the electric system operates and obtaining a sensitivity matrix of branch power to node injection power, obtaining a load flow transfer rate matrix according to the sensitivity matrix and the active power margin of a branch, obtaining the probability distribution condition of each element in a column vector corresponding to each node in the load flow transfer rate matrix in a load flow transfer rate statistical interval, calculating the improved information entropy according to the probability distribution condition to serve as the index for reflecting each node disturbance power transfer distribution balance degree, and conducting safety assessment on the system under the disturbance of each node according to the transfer distribution balance degree indexes. The method is used for quick assessment of the node injection power anti-interference capacity of the large-scale electric system, computing speed and accuracy can meet the requirements for online safety assessment of the large-scale electric system, and guidance can be provided for load management of the electric system and error control of a grid-connected wind power unit.