Herein, the effect of laser pulse time delay induced by seawater scattering is studied using the Monte Carlo numerical simulation method. Further, we analyze the effects of seawater types, transmission distance, and transceiver parameters on laser pulse time delay. The numerical simulation results indicate that in clear seas, the laser pulse time delay broadening does not obviously change with the increase of transmission distance. Furthermore, when the transmission distance is less than 50 m, the channel time delay is smaller than 0.5 ns, indicating the transceiver parameters exhibit only small impact on the channel delay. However, in turbid seas, the receiving power and the channel time delay increase with the increase of receiving aperture under the multipath effect induced by channel scattering. When the receiving angular field of view (AFOV) is less than 90°, its influence on the receiving power and the time delay broadening is observed to be significant. However, when the AFOV is between 90° and 180°, the receiving power and the time delay broadening demonstrate no obvious changes with AFOV.