Handheld inductive sensor special for electric iron

The invention discloses a handheld inductive sensor special for an electric iron. The sensor comprises a capacitance integral input module and a capacitance detecting unit, wherein the capacitance integral input module is formed by a signal generation electrode, a signal reception electrode, a switch sw1 and a switch sw2; the signal generation electrode is connected with the switch sw1 and the switch sw2 so as to be used for generating a pulse signal; the signal reception electrode is connected with the capacitance detecting unit through the switch sw1 and the switch sw2; the capacitance detecting unit is formed by a signal integral module, an analog-digital conversion module and a negative integral input module; the output end of the negative integral input module is connected with the input end of the signal integral module; the output end of the signal integral module is connected with the input end of the analog-digital conversion module; the output end of the analog-digital conversion module is connected