The invention provides a network capacity evaluation method, a device and equipment. The method, the device and the equipment relate to the communication field. The network capacity evaluation method,the device and the equipment can comprehensively and accurately evaluate the integral capacity of the to-be-evaluated network and improve planning efficiency of an ROADM network. The method comprisesthe steps of acquiring network parameters of a reconfigurable optical add-drop multiplexer (ROADM) network; wherein the network parameters can comprise the number-of-nodes and line rate of the ROADMnetwork, the number-of-local-dimensions of each node, and the wave channel capacity of each local dimension; according to the number-of-local-dimensions of the i-th node in the ROADM network, the wavechannel capacity and the line rate of a j-th local dimension in the i-th node, determining the node capacity of the i-th node; wherein i<=N, j<=Di, N is the number of nodes of the ROADM network, Di is the number-of-local-dimensions of the i-th node, N and Di are natural numbers; and determining summation of node capacities of all nodes of the ROADM network as the network capacity of the ROADM network.