Embodiments of this application disclose a path fault detection method and apparatus, a related device, and a storage medium, and belong to the field of communication technologies. In embodiments of this application, a return path is determined according to a forward path. In a path fault detection process, the return path through which a fault detection packet fed back by a tail node to a head node passes includes the forward path. In this way, if the head node receives the fault detection packet fed back by the tail node, it indicates that the forward path is not faulty.