The invention relates to a hydrogen sulfide leakage emergency removing dry powder, and a preparation method thereof. The hydrogen sulfide leakage emergency removing dry powder is mainly used for solving problems of existing technology that environmental pollution is caused, and removing efficiency is low. The hydrogen sulfide leakage emergency removing dry powder mainly comprises, by mass, 65 to 99% of a removing agent, 0.5 to 15% of a moisture-proof agent, and 0.5 to 20% of an additive; the additive is at least one selected from polyethylene glycol dimetyl ether, N-methylpyrrolidinone, propylene carbonate, tributyl phosphate, N-methylcaprolactam, methyl alcohol, alkyl alkylol amine, sulfolane, bentonite, carboxymethyl cellulose, and sodium carboxymethylcellulose. The hydrogen sulfide leakage emergency removing dry powder is capable of solving the above problems preferably, and can be used for hydrogen sulfide leakage emergency removing.