The invention discloses a wireless signal transmitter of a ship. The wireless signal transmitter comprises a signal coding circuit, a frequency selection circuit, a voltage stabilizing circuit and a power amplifier transmission circuit; the signal coding circuit codes signals to be transmitted through a coding chip, performs carrier output on the signals and then sends the signals to the input end of the frequency selection circuit via RC filtering; the frequency selection circuit generates resonance by an LC and performs frequency selection on an output signal of the signal coding circuit, and then the output signal is outputted to the power amplifier transmission circuit after being voltage stabilized by the voltage stabilizing circuit; and the power amplifier transmission circuit performs power amplification on the output signal of the voltage stabilizing circuit. The wireless signal transmitter of the ship provided by the invention has the advantages of being strong in anti-interference and anti-attenuation, and accurate in signal transmission.