Maritime wet exhaust gas cleaning system for controlling exhaust gas velocity

The present invention relates to a wet cleaning system for a ship capable of controlling the inflow speed of exhaust gas, including: a body forming an exhaust gas processing space in which the exhaust gas is processed by a gas-liquid reaction; an exhaust gas inlet pipe connected to the body and forming a line through which the exhaust gas discharged from an engine for the ship is fed to the body; and an exhaust gas inflow speed adjusting unit provided in the exhaust gas inlet pipe, and adjusting a cross sectional area of the exhaust gas inlet pipe or controlling chaotic flow of the exhaust gas through the exhaust gas inlet pipe to have a uniform path.