The invention relates to a sacrificial anode for controlling large caliber pipeline outer wall corrosion, which is used in a sacrificial anode protection device (3) for controlling the large caliber pipeline outer wall corrosion. The sacrificial anode is characterized in that the sacrificial anode (302) for controlling the large caliber pipeline outer wall corrosion has a rod shape, and the ratio of the length to the cross section outer diameter of the sacrificial anode is between 3 and 10. The sacrificial anode can ensure the sustainability of the pipeline jacking construction, greatly saves the assembly workload and the assembly cost, can achieve long-term protection through one-time construction, and meets the requirements of durability of large-scale engineering construction. The sacrificial anode has foreseeable enormous economic value and social value in engineering application.