Conjoined rectangular cap lightning rod

The utility model provides a conjoined rectangular cap lightning rod, which comprises a lightning rod body group formed by a plurality of lightning rod bodies sleeved with rubber tubes. The top of the lightning rod body group is provided with a rectangular cap. The four edges of the rectangular cap are provided with sloped platforms connected with the roof of a building. By means of the rectangular cap, the rainwater is prevented from entering the lighting rod to corrode the lighting rod bodies. Meanwhile, by means of the rubber tubes sleeved onto the lighting rod bodies, during the heat-expansion and cold-contraction process, the cement cracking phenomenon is prevented, so that the normal usage of the roof of the building is prevented from being influenced. The lightning rod is simple in structure, no damage to a roof, no influence to pedestrians and vehicles on the roof, and long in service life.