A power-on reset circuit, comprising: a band-gap reference circuit, a current comparator, and a voltage comparison circuit, the band-gap reference circuit, the current comparator, and the voltage comparison circuit being powered by a voltage source; wherein a first output terminal of the band-gap reference circuit is connected to a control terminal of the current comparator, for inputting a first signal to the control terminal of the current comparator to control operation of the current comparator; a first current input terminal of the current comparator receives a first current signal, a second current input terminal of the current comparator receives a second current signal, and an output terminal of the current comparator is connected to a control terminal of the voltage comparison circuit for inputting a second signal, when a voltage of the first signal is greater than or equal to a first preset value and a power supply voltage of the voltage source is greater than or equal to a second preset value, to the control terminal of the voltage comparison circuit to control operation of the voltage comparison circuit, wherein the first preset value is a voltage threshold indicating that the first signal output by the band-gap reference circuit reaches a stable voltage, the second preset value is greater than or equal to an operating voltage of the current comparator; and wherein the first current signal and the second current signal are from the band-gap reference circuit, a second output terminal of the band-gap reference circuit is connected to the first current input terminal of the current comparator for inputting the first current signal to the current comparator; and a third output terminal of the band-gap reference circuit is connected to the second current input terminal of the current comparator for inputting the second current signal to the current comparator; and a first input terminal of the voltage comparison circuit is connected to the first output terminal of the band-gap reference circuit to receive the first signal, a second input terminal of the voltage comparison circuit receives a signal indicating a voltage value of the voltage source, and an output terminal of the voltage comparison circuit is used to output a power-on reset signal when the voltage comparison circuit receives the second signal, and the signal for indicating the voltage value of the voltage source is greater than the first signal. wherein a first output terminal of the band-gap reference circuit is connected to a control terminal of the current comparator, for inputting a first signal to the control terminal of the current comparator to control operation of the current comparator; a first current input terminal of the current comparator receives a first current signal, a second current input terminal of the current comparator receives a second current signal, and an output terminal of the current comparator is connected to a control terminal of the voltage comparison circuit for inputting a second signal, when a voltage of the first signal is greater than or equal to a first preset value and a power supply voltage of the voltage source is greater than or equal to a second preset value, to the control terminal of the voltage comparison circuit to control operation of the voltage comparison circuit, wherein the first preset value is a voltage threshold indicating that the first signal output by the band-gap reference circuit reaches a stable voltage, the second preset value is greater than or equal to an operating voltage of the current comparator; and wherein the first current signal and the second current signal are from the band-gap reference circuit, a second output terminal of the band-gap reference circuit is connected to the first current input terminal of the current comparator for inputting the first current signal to the current comparator; and a third output terminal of the band-gap reference circuit is connected to the second current input terminal of the current comparator for inputting the second current signal to the current comparator; and a first input terminal of the voltage comparison circuit is connected to the first output terminal of the band-gap reference circuit to receive the first signal, a second input terminal of the voltage comparison circuit receives a signal indicating a voltage value of the voltage source, and an output terminal of the voltage comparison circuit is used to output a power-on reset signal when the voltage comparison circuit receives the second signal, and the signal for indicating the voltage value of the voltage source is greater than the first signal.