A switch control circuit, comprising: a first control switch, configured to transmit a power source signal when being turned on; a first capacitor, wherein the first capacitor is connected to the first control switch, and configured to receive the power source signal for charging, and to release a charging voltage when the first control switch is turned off; and a field-effect transistor switch, connected to the first capacitor, wherein the field-effect transistor switch is configured to receive the charging voltage released by the first capacitor to control the field-effect transistor switch to be turned on; a second control switch, connected to a drain electrode of the field-effect transistor switch, and configured to be turned on when the first capacitor is charged, and turned off when the first capacitor is discharged; and a signal processing circuit, connected in parallel to two ends of the second control switch, wherein the signal processing circuit is configured to process, when the second control switch is turned off, an analog signal transmitted by the field-effect transistor switch; wherein the signal processing circuit is an analog front end, and the analog front end comprises: an operational amplifier, wherein a reverse input end of the operational amplifier is connected to the drain electrode of the field-effect transistor switch, and a forward input end of the operational amplifier is configured to receive a reference voltage; and a sampling capacitor, wherein one end of the sampling capacitor is connected to the reverse input end of the operational amplifier, and the other end is connected to an output end of the operational amplifier, wherein the second control switch is connected in parallel to two ends of the sampling capacitor, wherein a working state of the signal processing circuit comprises a reset state and an amplified state; wherein, when the first control switch is turned on and the second control switch is turned on, the signal processing circuit works in the reset state; and wherein, when the first control switch is turned off and the second control switch is turned off, the signal processing circuit works in the amplified state. a first control switch, configured to transmit a power source signal when being turned on; a first capacitor, wherein the first capacitor is connected to the first control switch, and configured to receive the power source signal for charging, and to release a charging voltage when the first control switch is turned off; and a field-effect transistor switch, connected to the first capacitor, wherein the field-effect transistor switch is configured to receive the charging voltage released by the first capacitor to control the field-effect transistor switch to be turned on; a second control switch, connected to a drain electrode of the field-effect transistor switch, and configured to be turned on when the first capacitor is charged, and turned off when the first capacitor is discharged; and a signal processing circuit, connected in parallel to two ends of the second control switch, wherein the signal processing circuit is configured to process, when the second control switch is turned off, an analog signal transmitted by the field-effect transistor switch; wherein the signal processing circuit is an analog front end, and the analog front end comprises: an operational amplifier, wherein a reverse input end of the operational amplifier is connected to the drain electrode of the field-effect transistor switch, and a forward input end of the operational amplifier is configured to receive a reference voltage; and a sampling capacitor, wherein one end of the sampling capacitor is connected to the reverse input end of the operational amplifier, and the other end is connected to an output end of the operational amplifier, wherein the second control switch is connected in parallel to two ends of the sampling capacitor, wherein a working state of the signal processing circuit comprises a reset state and an amplified state; wherein, when the first control switch is turned on and the second control switch is turned on, the signal processing circuit works in the reset state; and wherein, when the first control switch is turned off and the second control switch is turned off, the signal processing circuit works in the amplified state. an operational amplifier, wherein a reverse input end of the operational amplifier is connected to the drain electrode of the field-effect transistor switch, and a forward input end of the operational amplifier is configured to receive a reference voltage; and a sampling capacitor, wherein one end of the sampling capacitor is connected to the reverse input end of the operational amplifier, and the other end is connected to an output end of the operational amplifier, wherein the second control switch is connected in parallel to two ends of the sampling capacitor, wherein a working state of the signal processing circuit comprises a reset state and an amplified state; wherein, when the first control switch is turned on and the second control switch is turned on, the signal processing circuit works in the reset state; and wherein, when the first control switch is turned off and the second control switch is turned off, the signal processing circuit works in the amplified state.