The utility model provides a parallel gap lightning protection device, and belongs to the technical field of power distribution line lightning protection. The technical problem to be solved is to provide the parallel gap lightning protection device aiming at a power distribution line so that a problem of lightning stroke disconnection of the power distribution line can be effectively solved, lightning stroke flashover can be accurately positioned, generation of lightning stroke flashover can be monitored according to a glass bushing, and thus the structure is simple and installation is convenient. The adopted technical scheme is that a drainage tube closely sleeves on a conductive wire. The internal wall of the drainage tube is provided with multiple penetrating stabs penetrating through an insulating layer. The transverse end part of a right-angle L-shaped conductive wire side electrode is a sphere and the vertical end part is fixedly connected with the drainage tube. One glass bushing monitoring lightning stroke flashover is arranged and fixed on the transverse rod of the conductive wire side electrode in a sleeving way. One end of a ground side electrode is a sphere and the other end is fixedly connected with the bottom end of an insulator. The ground side electrode has a broken line structure, and one end close to the sphere is provided with a ridge-shaped protrusion. The electrode end parts of the conductive wire side electrode and the ground side electrode are absolutely aligned.