Abstract: Branch defects of photovoltaic power stations are the most common and the occupy the largest proportion defects in the operation and maintenance of photovoltaic power stations. In this paper, through the operation and maintenance practice of 50 kWp distributed photovoltaic power station in Leshan Vocational and Technical College, several typical branch defects of photovoltaic power stations are checked and quickly treated, and a set of quick troubleshooting methods and corresponding treatment measures for branch defects of grid-connected photovoltaic power stations are summarized.