Plug-in cooling device for ship

The utility model provides a plug-in cooling device for a ship, which comprises a rear ship cabin wall, a ship main machine, a fresh water circulating pump connected with the main machine and heaters, wherein the inlet end and the outlet end of the fresh water circulating pump are respectively connected with one end of a stop valve; the other ends of the two stop valves are connected with the heaters 2; the inlet end and the outlet end of each heater 2 are respectively connected with a connecting pipeline; the two connecting pipelines which are respectively provided with a ball stop valve respectively penetrate through the rear ship cabin wall to be connected with an outboard external heater by two flange holes arranged on a waterline of the rear ship cabin wall in a sealed manner; and the connecting pipelines are connected with pipeline circulating pumps. The effects of the utility model lie in that the structure cools the surface of the heaters by utilizing vortex generated by the traveling speed of a ship,