Warning device for preventing children from being lost

The invention discloses a warning device for preventing children from being lost. The warning device comprises two parts: a host machine and an auxiliary machine. The host machine is characterized in that an adding button, a reducing button and a searching button are arranged on a single chip; the single chip is communicated with a self-luminous display through a wire; the single chip is communicated with a wireless transmission module through the wire; one pin of the single chip is communicated with a resistor R1; the resistor R1 is communicated with a base electrode of an audion B1; a collector electrode of the audion B1 is communicated with a vibration motor; an emitter electrode of the audion B1 is grounded; the other pin of the single chip is communicated with a resistor R2; the resistor R2 is communicated with a buzzer; the buzzer is in serial connection with the vibration motor. The auxiliary machine is characterized in that the single chip is communicated with the wireless transmission module through the wire; one pin of the single chip is communicated with a button; the other pin of the single chip is communicated with a resistor R3; the resistor R3 is communicated with the base electrode of the audion B3; the collector electrode of the audion B3 is communicated with the vibration motor; the emitter electrode of the audion B3 is grounded. The warning device for preventing children from being lost is reasonable in structure and good in use effect.