An embodiment of the invention discloses a ring network-based communication method. A ring network comprises a plurality of apparatuses; the apparatuses are physically connected mutually to form a single ring; each apparatus at least comprises two ports; and the ring network comprises a main line and a spare line which are in a communication state. The method comprises the following steps that: in each communication period of performing real-time communication, each apparatus of the apparatuses sends messages from the main line and the spare line according to a previously set sequence and receives the messages sent by other apparatuses; and when the messages which are mutually redundant and sent by the same apparatus, the equipment selects a message from the messages which are mutually redundant. In each communication period, all apparatuses redundantly send the messages according to an initially configured sequence so as to avoid message collision, avoid the influence of packet loss, error code and the like on the communication, and improve the determinacy and the stability of the communication of the ring network.