The invention discloses a vehicular flicker frequency matching device suitable for a vehicle which includes a power relay having a two-power output; a turn signal driven by the power relay and at least electrically connected between two output ends; a light source of a light-emitting diode at least connected with the two output ends of the power relay, an induction unit for outputting a controlling signal excited when the LED of the light source is electrified, and a matching unit controlled by the induction unit to provide impedance matching, wherein the matching unit comprises a matching impedance connected in series between two output ends of the power relay and a switching unit excited by the controlling signals output by the induction unit, while the matching impedance is electrically connected between two output ends.