The present invention relates to a lightning protection device, comprises: a front cover member; a first insulation member; an electric conduction pin; a second insulation member; a connector, a through hole is longitudinally installed in the connector; a gas tube installed in the through hole; a top cover; and a grounding base having a base hole for accommodating the connector and is contact with the top cover, a screw hole is installed at one end of the base hole for fastening a locking member. The mentioned lightning protection device has advantages of utilizing less components, reducing volume and lowering production cost.