A marine clothes dryer includes a system for recovering waste heat from cooling water in a cylinder liner, a clothes drying system, and a regenerator system. The system for recovering waste heat from cooling water includes an engine cylinder liner, a water collector, and an air-water heat exchanger. The clothes drying system includes a drying chamber, a circulating fan, a supply duct, and an exhaust duct. The regenerator system includes a gravity heat pipe exchanger with a condensing section and an evaporating section. A fresh air inlet is arranged at one side of the condensing section, and the other side thereof is in communication with one side of the air-water heat exchanger. The other side of the air-water heat exchanger is in communication with the drying chamber (15). One side of the evaporating section is provided with an exhaust port, and the other side thereof is in communication with the drying chamber.