The invention discloses a concurrence analysis method and device. The concurrence analysis method comprises the steps of obtaining a program control flow diagram, wherein each thread establishing node in the program control flow diagram is a direct precursor node of a starting node of a thread established by the thread establishing node; calculating an initial concurrence node set of the starting nodes of all threads in the program control flow diagram, an initial concurrence node set of direct successor nodes of the nodes established by the threads and an initial non-concurrence node set of the direct successor nodes of terminal nodes of the threads; initializing the concurrence node set of the starting nodes of the program control flow diagram, beginning to perform downward traversal from the starting nodes of the program control flow diagram and calculating the concurrence node set of the traversed nodes according to an inheritance rule. Due to the fact that the concurrence node set of each node is obtained through one-time traversal, operation is simple, operation amount is low, and the purpose of improving concurrence analysis efficiency is achieved.