The invention provides a composite material grounding module and a manufacturing mold thereof. The module comprises two or more grounding modules which are sequentially connected through connecting wires. The grounding module comprises a metal skeleton and a composite layer wrapping the metal skeleton. Two ends of the metal skeleton respectively penetrate through the composite layer and are provided with connecting holes. According to the technical scheme provided by the invention, the grounding modules formed by the metal skeleton and the composite layer are sequentially connected to form thegrounding module group; the hygroscopicity and adhesiveness of the composite layer are better than those of metal, and the compactness of the composite layer bonded with soil is better than that of the metal, so that the contact resistance between the grounding module group and the soil and the grounding resistance of the grounding module group are reduced; and the composite material can play a role in protecting the metal, so that the corrosion of the metal is avoided, the corrosion resistance of the whole grounding module group is improved, and the service life of the grounding module groupis greatly prolonged.