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In order to solve the problem of cableless information transmission between the sensor node and the host in the ocean observation system, a low-power underwater half-duplex wireless communication module based on magnetic field coupling is designed. Information is transmitted by electromagnetic induction between coils, and the baseband signal is modulated using Binary Frequency Shift Keying (2FSK) modulation. Ultra-low power microcontroller MSP430F5338 is the main control unit. The modulation carrier is generated through the output module of the internal timer, and change the frequency in the external interruption to realize signal modulation; the special demodulation chip XR2211 is used for signal demodulation. The module is woken up by the signal on the communication bus, a method of carrier signal detection through software is designed to reduce false trigger probability. The experimental results show that the communication success rate reaches 100% when the module is 2 meters apart underwater. The implementation of the node is simple, and the cost and power consumption are low. This module meets the application requirements in the ocean observation system due to the simple design, low cost and low power consumption.