Gemini cationic surfactant and preparation method thereof, and fracturing fluid

The invention provides a gemini cationic surfactant. The gemini cationic surfactant has a structure shown in formula I; in the formula I, R is alkyl with a carbon atom number of 10-30, n is 11-17, m is 2-6, X is O or N, and Y is halogen. Compared with the prior art, the gemini cationic surfactant innovatively combines the functions of self-degradation and automatic gas generation by means of ingenious molecular structure design. The invention provides fracturing fluid which has the excellent properties such as low inorganic salt consumption, self-degradation and automatic gas generation at the same time; after the fracturing fluid is degraded, the products are hydrophilic micromolecules and oleophylic molecules which are harmless to stratum, so that the fracturing fluid does not need to be enabled to flow back. The invention also provides a preparation method of the gemini cationic surfactant, and the fracturing fluid.