Middle bearing for ship

The invention relates to the field of ship shaft-system supporting assemblies, and discloses a middle bearing for a ship. The middle bearing comprises a bearing housing, a rotary shaft, a bearing support base, a lower bearing brush, an upper bearing brush, a lubricating slot and an oil throwing disc, wherein the bearing support base is fixedly arranged inside the bearing housing; the lower bearingbrush and the upper bearing bush are arranged on the bearing support base; the rotary shaft is sleeved between the lower bearing brush and the upper bearing bush; the oil throwing disc fixedly sleeves the rotary shaft; and the lubricating slot is formed in the top of the upper bearing brush. According to the middle bearing for the ship disclosed by the invention, lubricating oil before and afterlubricating is separated by a ring-shaped sleeve outside the oil-throwing disc to define a reflow cavity and a cooling cavity; and hot oil in the reflow cavity is indirectly controlled to enter the cooling cavity to cool throu