The utility model relates to a lightning arrester, and belongs to the field of lightning protection facilities. The lightning arrester comprises a base. A plurality of installation rods are fixed at the upper end of the base in an upward inclination mode, cluster-like lightning rods are fixed at the end portions of the installation rod, a bird-prevention stab is fixed at the bottom of the base, the bird-prevention stab is circumferentially installed on the base, the height of the bird-prevention stab is lower than the height of the bottoms of the lightning rods, a stabilizer bar is arranged between neighboring lightning rods, and the two ends of each stabilizer bar are respectively fixed on the lightning rods so as to form a triangle. The lightning arrester has the advantages of high efficiency, low cost and simple installation.