The present invention discloses an unidirectional loop network controller. The controller comprises a receiving port, a direct connection forwarding module, a sending port and an IFG timer; and the controller also comprises a control state module configured to control a node to be located at a monitoring mode or the sending module or at a busy state or an idle state, a forwarding switching switch configured to switch a forwarding line between a receiving port and the sending port to forward line connection between the receiving port and the sending port through one of the direct connection forwarding, the fast forwarding or storage forwarding, and a frame timer configured to record the number of the data frames actively sent by one node in the unidirectional loop network. The unidirectional loop network controller solves the problem that the current unidirectional loop network cannot perform multi-frame forwarding at the same time, and provides cleaning and fault location of error data frames in the unidirectional loop network through the unidirectional loop network controller.