The present invention discloses a kelp harvester. The kelp harvester includes a ship body and a U-shaped tripping piece, where two working chain racks are symmetrically arranged on both sides of the ship body； each working chain rack is provided with a chain and a chain driving device used to drive the chain to operate； multiple rope clamping devices are fixedly arranged on each chain； the rope clamping devices can clamp main ropes, so that when the chains operate, the rope clamping devices can drive the ship body to move along with the operation of the chains； the U-shaped tripping piece is rotatablely connected to the ship body through a hinge； and the ship body is further fixedly provided with a limiting baffle, and the limiting baffle limits the U-shaped tripping piece to stopping rotation when the U-shaped tripping piece is in a vertical state.
