The invention discloses a polyoxyethylene ether sulfoacid gemini-surfactant-type drag reducer and a preparation method and application thereof. The structural formula of the drag reducer is shown in the description, wherein m is equal to 2 or 3 or 4, and n is equal to 1 or 2 or 3. The drag reducer is a surfactant-type drag reducer and particularly a gemini-surfactant-type drag reducer, the head group is sulfoacid and has the advantages of great temperature resistance, salt resistance, environment protection performance and the like, the influence of the high-salt environment on the drag reduction performance can be overcome, and therefore the drag reducer is high in drag reduction efficiency and shearing resistance capacity, durable and stable in drag reduction rate and good in salt tolerance; the polyoxyethylene ether sulfoacid gemini surfactants different in mass concentration are dissolved in water, and a drag reduction aqueous solution which is high in drag reduction efficiency andshearing resistance capacity, durable and stable in drag reduction rate and good in salt tolerance can be obtained; the preparation steps are simple, and the drag reducer is extremely convenient to use.