With the development of renewable energy technology and the strengthening of carbon emission control, microgrid, as an important part of distributed energy system, its operation optimization and resource sharing have become a research hotspot. In this paper, an optimal dispatch strategy for multi-microgrid resource sharing operation considering dynamic carbon trading mechanism is proposed, which aims to achieve carbon reduction and emission reduction while reducing system operating costs. Firstly, a dynamic carbon credit trading mechanism is established to encourage effective energy interaction and resource sharing among microgrids. Secondly, based on the asymmetric Nash negotiation theory, a multi-microgrid resource sharing and cooperative operation model considering the dynamic carbon trading mechanism is established. The alternating direction multiplier method is used for distributed solution to protect the privacy of each subject. Finally, the effectiveness of the proposed strategy is verified by an example simulation.