A circuit and a method for controlling operation voltage, and a storage device are provided. The circuit includes: a voltage boost unit adapted for: if receiving a first signal, performing a voltage boost process; and if receiving a second signal, stopping the voltage boost process; a voltage division unit including a plurality of different voltage division coefficients, adapted for performing a voltage division process; a comparison unit adapted for: comparing the divided voltage with a reference voltage; if the divided voltage is low, outputting the first signal; and if not, outputting the second signal; a control unit adapted for performing a descending switching operation on the voltage division coefficients; and an output unit. The establishing speed of the operation voltage is effectively controlled, and an effect on device power consumption and performance caused by the threshold voltage and variations of the threshold voltage in the working process is eliminated.