Abstract: At present, with the rapid development of China's rural economy, the rural power grid load also shows a rapid growth trend, which has a huge impact on the renewal of lagging transmission lines, transformers and other equipment, resulting in the increasingly serious problem of low node voltage at the end of distribution lines. In view of this problem, combined with the current situation of vigorously developing distributed photovoltaic power generation in rural areas, this paper proposes a method to solve the low node voltage problem of low-voltage distribution network based on distributed photovoltaic. For the open-loop radial power grid structure, it is established to minimize the total voltage deviation, adopt the particle swarm optimization algorithm, call the power flow calculation program, and iterate step by step to find the optimal access location and optimal output of photovoltaic system grid connection, In order to verify whether the use of photovoltaic to solve the problem of low node voltage is reasonable and effective.