The invention provides a method for determining reversing point positions of pumping units in electric power diagram data. The method comprises the following steps of: 1, continuously measuring electric power data to obtain a data sequence, artificially observing an operation state of a pumping unit, manually appointing a reversing point position, intercepting an electric power data segment with acomplete period from the data sequence, and taking the electric power data segment as a feature data sequence after filtering and normalizing the electric power data segment; and 2, taking an artificially measured electric power feature data sequence with reversing point position information as an original sequence, taking subsequently recorded electric power data as a to-be-compared sequence, and automatically judging a reversing point in the subsequently measured electric power data through an autocorrelation minimum variance method by utilizing feature data of the known reversing point position. According to the method for determining reversing point positions of pumping units in electric power diagram data, reversing points, during operation, of pumping units can be recognized in realtime through an intelligent algorithm without mounting any position sensor, so that the reliability is high and the reversing point recognition precision is high.