Monitoring device of solar power generation system

The present invention relates to a monitoring device of a solar power generation system. The solar power generation system includes a solar cell string formed by the connection of a plurality of solar cell modules. The monitoring device includes: a current measurement function part for measuring the current of the solar cell string; a voltage measurement function part for measuring the voltage of the solar cell string; a leakage current measurement function part for measuring the leakage current of the solar cell string; and an abnormal detection function part for detecting the abnormalities of the solar cell string on the basis of the current measured by the current measurement function part, the voltage measured by the voltage measurement function part, and the leakage current measured by the leakage current measurement function part.