The invention relates to the technical field of ships, in particular to a ship acoustic equipment anticorrosion device which comprises a lifting device, acoustic equipment, an acoustic equipment storage cavity, a sea suction valve, a fresh water supply device, a ventilation valve, a ventilation pipe, a discharging pipe and a discharging valve. One end of the lifting device is connected with the acoustic equipment, the acoustic equipment is arranged in the acoustic equipment storage cavity, the sea suction valve is arranged on the outer wall of the bottom of the acoustic equipment storage cavity, the fresh water supply device is arranged on the upper portion of the acoustic equipment storage cavity and communicated with the acoustic equipment storage cavity, the ventilation pipe is communicated with the acoustic equipment storage cavity, the ventilation valve is arranged on a connecting pipeline between the ventilation pipe and the acoustic equipment storage cavity, the discharging pipeis arranged at the bottom of the acoustic equipment storage cavity and communicated with the acoustic equipment storage cavity, the discharging valve is arranged on a connecting pipeline between thedischarging pipe and the acoustic equipment storage cavity. The anticorrosion device can prevent sea water from corroding the acoustic equipment storage cavity, and the service lives of the acoustic equipment and the lifting device are prolonged.