The underwater acoustic channel has the characteristics of prolonged propagation, fast radial loss, narrow communication bandwidth, etc. It is necessary to rationally allocate channel resources by designing an effective MAC protocol, thereby improving the performance of the underwater network. The Time Division Multiple Access (TDMA) protocol has the highest communication efficiency when the center receives data continuously, and is very suitable for the mobile aggregation of the information aggregation service. In view of the problem that the traditional TDMA protocol wastes the channel resources in time, a TDMA protocol based on time slot redistribution under the OPNET simulation platform is designed, which can adaptively allocate time slots and approximate the central node without interruption. The receiving data packet makes full use of the channel resources to improve the overall working efficiency of the network.