The invention discloses a dichotomy-based local voltage control method for a distributed power supply. According to the local voltage control method, an active power output and a reactive power output of the corresponding distributed power supply are controlled to properly increase or reduce by a dichotomy according to a real-time voltage collection value of a distributed power supply grid-connected point; reactive power adjustment is carried out by residual capacity of an inverter in priority under the premise of maximum power tracking of active power; if reactive power adjustment still does not work, the active power output is properly reduced; the operating environment of the distributed power supply is closely monitored; the active power output is timely increased to utilize natural resources to the maximal extent as soon as conditions permit; the controlled quantity is repeatedly adjusted by combining the control effect; and a grid-connected point voltage is finally controlled within an allowable range of voltage deviation. According to the method disclosed by the invention, the benefits of a distributed power supply owner are ensured; meanwhile, the method is simple in control strategy, low in information collection requirements and high in practicability; and the problem of voltage control when the distributed power supply is connected to a power grid can be well solved.