The invention relates to a norbornene, hexafluoropropylene and 2,5-dihydro-2,5-dimethoxy furan ternary polymerization method. The norbornene, hexafluoropropylene and 2,5-dihydro-2,5-dimethoxy furan ternary polymerization method is characterized by comprising the following steps: adding polymerization monomer norbornene, hexafluoropropylene and 2,5-dihydro-2,5-dimethoxy furan into a high-pressure kettle in a molar ratio being 1 to 1 to 1, and adding a solvent to dissolve; adding an initiator, reacting for 1-4 hours at a temperature being 0-150 DEG C under pressure being 1-3 MPa, wherein the initiator is prepared from di-tert-butyl peroxide and tert-butyl peroxyacetate in a molar ratio being (0.1:1) to (1:0.1), and dose of the initiator accounts for 0.1%-1.5% of the total weight of the polymerization monomer; pouring the product obtained by reaction into an alcohol containing solution, washing obtained precipitates with alcohol, and vacuum-drying to obtain the norbornene, hexafluoropropylene and 2,5-dihydro-2,5-dimethoxy furan ternary polymer.