The invention discloses a sound control switch system based on a differential amplification circuit. The sound control switch system is mainly constituted by a sound sensor, an amplifier P, a quartz oscillator X, a unidirectional thyristor D5, a sampling circuit serially connected between the sound sensor and the amplifier P, a capacitor C4, and a capacitor C5. The positive pole of the capacitor C4 is connected with the negative pole of the amplifier P, and the negative pole of the capacitor C4 is connected with the output end of the quartz oscillator X by a resistor R5. The negative pole of the capacitor C5 is connected with the output end of the quartz oscillator X, and the positive pole of the capacitor C5 is connected with the positive pole of the amplifier P by a resistor R4. The sound control switch system is advantageous in that sound signals acquired by the sound sensor are processed, and the definition of the sound signals is improved, and in addition oscillation signals generated by the sound control switch system are amplified without being distorted, and therefore by comparing with conventional sound control switch systems, the sensitivity of the sound control switch system is improved by 20%, and when pedestrians pass by the sound control switch system, street lamps are turned on without requiring loud sound, and nearby residents are not affected by the loud sound.