The application provides a pulse width modulation waveform output method, a charging/discharging controller and a storage medium, and relates to the technical field of the charging/discharging field.The method is applied to the charging/discharging controller, and comprises the following steps: setting a first pin as a push-pull mode, and a second pin and a third pin as open-drain modes, and outputting the corresponding pulse signal, the complementary signal or the DC constant signal through the first pin, the second pin and the third pin, thereby enabling a second output end to skip to highlevel and maintain for the first preset duration after the first DC pulse signal is skipped as the low level, and then performing following mode output, or enabling the second output end to output thecomplementary output signal in complementary with the first DC pulse signal, thereby performing complementary mode output. Through the method provided by the application, the outputs of the followingmode and the complementary mode are accomplished, and the cost of the small power controller in the charging/discharging is reduced.