Power-on reset circuit with low power consumption, small area and high precision

The invention discloses a power-on reset circuit with low power consumption, small area and high precision. The power-on reset circuit comprises a first voltage division module for providing a first input voltage for a comparison module; the second voltage dividing module provides a second input voltage for the comparison module, and the first input voltage controls the change of the second input voltage; when the first input voltage is higher than the second input voltage, an output signal of the comparison module is a high level, and when the first input voltage is lower than the second input voltage, the output signal of the comparison module is a low level; the pull-up module pulls up the second input voltage to a high level at the power-on moment of the power supply, so that the comparison module outputs a low level at the initial stage of power-on; and the hysteresis module is used for reducing the second input voltage when the power supply is reduced, so that the threshold inversion point of the comparison module is reduced. The area is reduced through the first voltage division circuit and the second voltage division circuit, weak pull-up is provided at the power-on moment through the pull-up module, and then the robustness of the circuit is improved.