Flame-retardant modified mineral oil as well as preparation method and application thereof

The invention provides flame-retardant modified mineral oil as well as a preparation method and application thereof, the flame-retardant modified mineral oil comprises mineral oil, a melamine flame retardant and a quaternary ammonium salt surfactant, the quaternary ammonium salt surfactant has the following structural general formula, in the formula, R1 is an alkane chain with more than C5; r2 is a perfluorocarbon chain with more than C5; a is one of Cl, Br and I. By adding the quaternary ammonium salt surfactant with a specific structure and containing a hydrocarbon chain and a fluorocarbon chain at the same time, the compatibility of the melamine flame retardant and the mineral oil can be improved, and the electrical performance of the mineral oil can be further improved, that is, the obtained mineral oil product has good flame retardance and good electrical and physical and chemical properties, and the mineral oil can be widely applied to the field of mineral oil products. And the preparation method is sim