The invention discloses a combustion-supporting desulfurization straw biomass combustion rod and a preparation method thereof. The combustion-supporting desulfurization straw biomass combustion rod is characterized by comprising in parts by weight, 2-3 parts of solid ethyl alcohol, 5-10 parts of sludge, 1-2 parts of yeast, 1-2 parts of bagasse, 5-10 parts of pulverized coal, 2-3 parts of polyvinyl alcohol, 3-6 parts of paraffin, 10-20 parts of yellow mud, 10-20 parts of straws, 1-2 parts of cement, 5-10 parts of rice straws, 5-10 parts of bamboo materials, 3-5 parts of branches, 4-8 parts of ferric oxide, 0.1-0.4 part of zirconium dioxide and an appropriate amount of water. The straws and the pulverized coal are matched to prepare the combustion rod, resources are sufficiently used, emission of poisonous gases such as sulfur dioxide is effectively decreased, environmental protection and human body health are facilitated, the solid ethyl alcohol is added into the combustion rod, so that fuel is easily ignited, and energy resources are saved.