Automobile low-speed-driving alarm system and alarm method thereof

The invention discloses an automobile low-speed-driving alarm system. The automobile low-speed-driving alarm system comprises an automobile-speed collecting unit, a gear signal collecting unit, a microprocessor and an alarm unit. The automobile-speed collecting unit and the gear signal collecting unit are connected with the input end of the microprocessor respectively, and the output end of the microprocessor is connected with the alarm unit. The automobile low-speed-driving alarm system of the structure has the advantages that automatic low-speed alarm is achieved; the mode of alarm is multiple; the multiple functions such as automobile backing reminding, charging reminding and electric quantity reminding are integrated; the under-voltage detection function, the overvoltage protection function and the over-current protection function are achieved.