The invention provides a method and device for determining the placement position of a regenerator. The method for determining the placement position of the regenerator comprises: acquiring the shortest path Pi between any two nodes in a network, the Pi is the ith path, and the i is an integer larger than or equal to 1; obtaining the optical signal to noise ratio OSNR of all paths; adding M pathsof which the optical signal to noise ratio (OSNR) is smaller than a preset threshold into a first set, wherein M is a positive integer; determining an attribute value of each node according to the repetition frequency of the node in the path in the first set; and determining the placement position of the regenerator according to the attribute value of the node. According to the method provided bythe invention, the signal transmission quality is ensured, and meanwhile, regenerator resources are effectively utilized.