The invention discloses a Gemini amine salt type fluorated surfactant and a preparation method thereof. The Gemini amine salt type fluorated surfactant is represented by formula I; in the formula I, R is a group represented by CmH2m+1, wherein m is an integer in a range of 0 to 3, and n is an integer in a range of 2 to 8. The preparation method for the surfactant comprises the following steps: (1) reacting 3-perfluorohexyl-1,2-epoxypropane with diamine represented by formula II so as to obtain a compound represented by formula III, wherein n is the integer in a range of 2 to 8, R is the group represented by CmH2m+1, and m is the integer in a range of 0 to 3; and (2) introducing HCl gas into an alcoholic solution of the compound represented by the formula III and carrying out a salt forming reaction so as to obtain the Gemini amine salt type fluorated surfactant represented by the formula I. The Gemini amine salt type fluorated surfactant provided by the invention has excellent surface properties and good foaming performance. According to the invention, raw materials used in the preparation method are cheap and easily available, the preparation method is simple, reaction conditions are easy to control, and the product--the surfactant is easy to purify.