Fluorine-coated sealing ring

The utility model relates to the technical field of pipeline joint sealing, in particular to a fluorine-coated sealing ring. The utility model provides a fluorine-coated sealing ring, which comprises a PFA (Polyfluoroalkoxy) outer coating, a fluorine rubber inner core and a fluorine rubber outer coating, the extrusion rings made of the same material are symmetrically arranged on the outer side of the PFA outer coating layer up and down; an inner groove is formed in the middle of the inner ring of the PFA outer coating, and the inner ring is arranged in the inner groove in a contact mode. The sealing ring formed by combining the PFA outer coating and the fluororubber inner core has good performance of adapting to working environment changes while keeping rubber performance, and when vibration occurs, the inner ring with small deformation quantity can avoid the situation that due to rapid vibration, a gap is formed between the PFA outer coating which is prone to deformation and a to-be-sealed part, and conseque