The invention belongs to the field of organic chemistry and relates to a perfluor dioxole-modified fluorine-containing polymer. A general formula of the perfluor dioxole is as shown in the specification, wherein R and F represent RF or ORF; RF is C1-C5 linear or branched perfluoroalkyl; X1 and X2 are independently used as F or CF3; and a fluorine-containing olefin monomer accounts for 80-99.1% of mass of a copolymerized monomer. According to the polymer disclosed by the invention, the glass-transition temperature is greater than 65 DEG C; the particle size is smaller than 120mum; the intrinsic viscosity is greater than 1.0dl/g; the polymer can be completely dissolved into common esters and other strong polar solvents; the problems that the glass-transition temperature of F23 fluorine polymers at present is relatively low and the like are solved; and the polymer can be widely applied to the military industry, and can be used as a binder for a polymer-bonded explosive and a binder for current collector metal for cells.