The present disclosure illustrates a current balance method and a current balance circuit thereof. The current balance method is used in a multiphase digital pulse width modulator. Steps of the current balance method are as follows. A plurality of pulse width values of the pulse width modulated signals within a first period are recorded, and a minimum pulse width value is defined as a standard value. The method determines whether each pulse width value is larger than the sum of the standard value and a pulse width threshold, and if yes, the method adds 1 to a count value of the phase output stage corresponding to the pulse width value. The method determines whether each count value equals to a counting threshold, and if yes, the method adjusts the pulse width modulated signal, and initializing the count value as 0.
