The utility model discloses a fairway buoy fixing device, including maring boat deck, the fairway buoy, the fairway buoy is equipped with the lamp stand and the hollow mark body, its characterized in that is still including setting firmly the lower couple on maring boat deck, couple and wire tensioner on the lamp stand lower extreme connect firmly, the wire tensioner includes the scroll cover, pass through the last screw rod and lower screw rod that the screw thread links to each other with the scroll cover, last screw rod passes through the coupling hook and links to each other with last couple, the screw rod allies oneself with down has rings, the one end of a chain is with the couple is continuous down, the other end of chain passes rings and links to each other with the middle chain link of chain. The utility model has the advantages of connect portably, firm, and the area occupied is little, is convenient for to the cleaning work who marks ship and fairway buoy.