The invention discloses a SpaceWire communication network fault recovery method and system. The method comprises the steps of: when monitoring that a main communication link of a certain communication node in a SpaceWire communication network has a fault, activating a standby communication link of the certain communication node, wherein the certain communication node is redundantly connected with two or more routers; according to the link information of the standby communication link of the certain communication node, performing dynamic optimization reconstruction on the SpaceWire communication network to obtain a reconstructed route table; and configuring the reconstructed route table to a router to perform fault recovery on the SpaceWire communication network. The method and the system solve the fault recovery problem of a link disconnection error of the SpaceWire network under spatial radiation.