Refrigeration house for ship and ro-ro passenger ship

The invention discloses a refrigeration house for a ship and a ro-ro passenger ship. The marine refrigeration house comprises a refrigeration house body, a cold air pipe, a heat insulation supporting seat and a fan arranged in the refrigeration house body, the refrigeration house body is supported on the cabin bottom of a cabin at intervals through the heat insulation supporting seat, the fan is installed on the side wall of the refrigeration house body, and the cold air pipe is arranged outside the refrigeration house body and used for conveying cold air into the refrigeration house body. One end of the cold air pipe penetrates through the side wall of the refrigeration house body to be communicated with the interior of the fan, a water collecting tank is arranged in the fan and used for collecting condensate water discharged from the cold air pipe, a floor drain is arranged at the bottom of the refrigeration house body, the water collecting tank is communicated with the upper end of the floor drain through