The invention relates to a multi-wireless-communication integration system used for a buoy and a control method. The system comprises a control module, and a communication module, a data storage module and a dip switch which are respectively connected to the control module, wherein a power supply module provides electric energy for the modules. The method comprises the following steps that the control module judges a working mode of the system through the dip switch, starts a configuration channel in a configuration mode, and carries out parameter configuration of the communication module; andthe control module collects buoy observation data in a communication mode, and selects an optimal communication mode to send the buoy observation data to a land-based data receiving station within each data sending period according to the signal strength. According to the system and the method, the receiving real-time integrity of the buoy observation data is guaranteed, the repeated sending of the same data is avoided, the workload of data management and analysis of a land-based receiving server is reduced, and meanwhile, only the optimal communication mode module is used for data transmission within each data acquisition and sending period, and other communication modules are in a dormant state, so that the overall power consumption of a buoy communication system is also reduced.