A waterproof circuit and a handset

The utility model discloses a waterproof circuit, comprising a humidity sensor and a triggering shutdown unit. The humidity sensor is connected with the triggering shutdown unit which is connected with an external connection circuit, and the humidity sensor outputs the voltage or the frequency to the triggering shutdown unit. When the voltage or the frequency is higher than the preset value of the triggering shutdown unit, the triggering shutdown unit makes the electric apparatus automatically cut power. The utility model discloses a handset, comprising a humidity sensor and a triggering shutdown unit. The humidity sensor is connected with the triggering shutdown unit which is connected with an external connection circuit, and the humidity sensor outputs the voltage or the frequency to the triggering shutdown unit. When the voltage or the frequency is higher than the preset value of the triggering shutdown unit, the triggering shutdown unit sends out a trigger signal to a power supply circuit which makes the handset cut power, so the circuit of the handset can be protected.