To solve the inter-chiplet deadlock and network connectivity problems caused by link failures in multi-chiplet network, an optimized packet retransmission mechanism for multi-chiplet network was proposed. By using the “message merging” function in the retransmission mechanism, the number of control packets and the network load was reduced. By using the “message forwarding” function and adopting the forwarding to neighbor strategy, the fault-tolerant cost of the inter-chiplet network link failure was reduced. And more balanced load of the intra-chiplet network was realized. The simulation results show that the proposed method can increase the saturation bandwidth by 12-5%~25% with similar latency compared with the turn restriction strategy. Furthermore, it can increase the saturation bandwidth by up to 50% in case of link failures. “Message merging” can effectively reduce the number of control packets, thus reduce the overall load of the network. “Packet forwarding” has lower fault-tolerance cost and can achieve more balanced load of intra-chiplet network.