A three-button earphone control box optimization circuit capable of switching an Android or Apple system, comprising a plug of 3.5 mm, an Apple IC, a three-button control button, a field effect transistor (Q1) and a microphone module. The circuit further comprises a changeover switch, a resistor network changeover module and a diode (D7). When the changeover switch is switched to a switching end of an Apple mode, a signal generated by the Apple IC controls the enabling of the field effect transistor (Q1), and at the same time, a voltage bias level generated by the Apple IC is transmitted to a positive electrode end of a microphone capable of being recognized by an Apple device, so that the same field effect transistor (Q1) and the positive electrode end of the microphone are shared in both an Android mode and an Apple mode. A three-button built-in microphone control box combining two different circuit structures enables the circuit to simultaneously support Android and Apple devices. By means of a changeover
