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With the rapidly increasing interests in ocean observation and ocean Internet of Things, low-cost underwater acoustic communication equipment draws more and more attention from the research community. The low complexity and high reliability multi frequency shift keying(MFSK) modulation provides an effective technical solution. However, the typical time-space-frequency characteristic of the underwater acoustic channel will cause severe amplitude fading to the MFSK underwater acoustic communication. Considering that the chip MAX9814 has a large-range automatic gain adjustment capability, it is adopted for anti-fading processing of underwater MFSK communication. The experimental results show that MAX9814 can effectively suppress the amplitude fading caused by the underwater acoustic channel, thus improve the performance of the underwater acoustic MFSK communication.