The present invention relates to an iron phosphate battery self-power restoration device for a vehicle when a lithium iron phosphate starting battery is discharged, and more particularly, when the vehicle starts when the vehicle iron phosphate battery, which has replaced the conventional lead-acid battery, is discharged, the relay module activates the iron phosphate battery. The present invention relates to a device in which an iron phosphate battery can restore its own power by switching to connect a battery and an electric field, and driving a starter motor by the residual voltage of the iron phosphate battery and a starter capacitor. The present invention provides an iron phosphate battery that is discharged and managed by a BMS connected to one of the iron phosphate battery output lines connected to the electric length of the vehicle; An iron phosphate battery self-management device for a vehicle comprising a starter motor connected in parallel to an iron phosphate battery output line between the BMS and an electric length of the vehicle, a generator, and an integrated power meter, connected in parallel to the starter motor, and an instantaneous high current a starter capacitor, which is a supercapacitor through which discharge is performed; and a relay module for switching and connecting a parallel connection line connecting the integrated power meter and one line connected to the BMS between the BMS and the iron phosphate battery. When the vehicle is started when the iron phosphate battery is discharged, the relay module is is switched to bypass the BMS and connect the iron phosphate battery to the electric field, the starter capacitor is connected to the starter motor, the starter motor is driven by the residual voltage of the iron phosphate battery and the starter capacitor, and the BMS is the phosphate The technical gist of the technical gist is an iron phosphate battery self-power restoration device of a vehicle when a lithium iron phosphate starting battery is discharged, which is characterized in that the iron phosphate battery is managed by setting the residual voltage of the iron battery to 11.5±1 V.
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