The invention provides a ship collision avoidance processing method for a multi-ship game. The ship collision avoidance processing method is characterized by comprising the following steps: S1, whena target ship runs in a cluster of a complex navigation environment, acquiring basic information of the target ship, basic information of the cluster where the target ship is located and basic information of all clusters in a preset area; S2, determining an optimal selection strategy for target ship collision avoidance by adopting a ship collision avoidance model of a multi-ship dynamic game of phase field coupling and incomplete information based on all acquired information by the target ship; and S3, controlling the ship to execute collision avoidance operation according to the determined optimal selection strategy by the target ship. The cluster ship is taken as a research object, the completeness of information which can be obtained by a game party is considered, and the method is highin effectiveness and reliability.