A light emitting buoyage with a magnetic switch comprises a buoyage magnetic switch body connected to the buoyage; a light emitting diode at an upper end of the magnetic switch body; a battery at a lower end of the light emitting diode; a magnetic element at a lower end of the battery; a connecting wire of the magnetic switch body extending from a lower end of the magnetic element; and a switch unit installed in the magnetic switch body at one side of the magnetic element. The battery and the magnetic element are transversally or longitudinally in the magnetic switch body. The magnetic element has a body. The body is installed with at least one retaining magnetic block and at least one movable magnetic block. The body is screwed to a lower end of the magnetic switch body; and the connecting wire is connected to the movable magnetic block.