A method for adjusting margin, a circuit for adjusting margin, and a memory are provided. The method is applicable for a memory including a plurality of delay sub-circuits. The method includes: determining a voltage parameter and a temperature parameter, obtaining a target delay value by performing calculation on the voltage parameter and the temperature parameter through a preset time margin model; and adjusting a time margin of the memory by controlling working states of the plurality of delay sub-circuits according to the target delay value.