The invention provides a trust data updating method and device. The block chain network comprises a global chain network and a plurality of local chain networks, each local chain network comprises a plurality of local chain nodes, the plurality of local chain nodes comprise a management node participating in the consensus of the global chain network, and the global chain network comprises the management node of each local chain network; the trust data updating method is executed by a first management node in a first local chain network, and the first local chain network is any local chain network in a plurality of local chain networks. Therefore, the block chain network is divided into a global chain network and a plurality of local chain networks; nodes in different local chains are interacted; the trust data of the nodes interacting in the local area chain network can be acquired through the management node in each local area chain network, and the trust data is written into the block chain in the global chain network after being consented in the global chain network, so that only the participation of the management nodes is needed during consensus, the trust convergence speed ishigh, and the decision making efficiency is high.