The invention provides a ship conduit which can be produced simply at the same time of maintaining the performance thereof as an energy conservation device, and a method for producing the ship conduit and a ship provided with the ship conduit. The ship conduit (4) is provided with an outer conduit board (10) which is used as one part of a cone, wherein, the diameter of the front side of the ship is larger than that of the tail side and the length of the upper side is larger than that of the lower side; a column inner ship-tail side board (20) arranged in the middle of the outer conduit board (10), wherein, the length of the upper side is larger than that of the lower side; an inner ship-front side board (30) arranged in the middle of the outer conduit board (10). The ship-tail side edge (12) of the outer conduit board (10) is connected with the ship-tail side edge (22) of the inner ship-tail side board (20); the ship-front side edge (11) of the outer conduit board (10) is connected with the ship-front side edge (31) of the inner ship-front side board (30); and the ship-tail side edge (32) of the inner ship-front side board (30) is connected with the ship-front side edge (21) of the inner ship-tail side board (20).
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