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This invention discloses an alarm tracing method, apparatus, and electronic device for a power dispatching system. The method includes: collecting multi-source heterogeneous alarm data from the power dispatching system within a predetermined time period; determining multiple alarm characteristic parameters based on the multi-source heterogeneous alarm data; constructing an initial causal graph based on the multiple alarm characteristic parameters; determining the correlation between the alarm events corresponding to the two nodes of each edge in the multiple edges; performing corresponding target operations on the multiple edges in the initial causal graph based on the correlation determination results for each edge, obtaining a target causal graph; and tracing the alarm sources in the power dispatching system based on the target causal graph to obtain the fault results. This invention solves the technical problem in related technologies where it is impossible to quickly determine fault results when there is a large amount of alarm data in the power dispatching system.