String falling detection method and device of photovoltaic power generation system, electronic equipment and medium

The invention discloses a string drop detection method and device for a photovoltaic power generation system, electronic equipment and a medium, and the method comprises the steps: obtaining a to-be-detected first image, inputting the first image to a trained target detection network, and obtaining a first output result; inputting the first output result into a trained feature extraction network to obtain a second output result under the condition of determining that the annotation box in the first output result meets a first set condition; the second output result comprises a first feature and at least one group of second features; the first feature is used for representing a feature extracted by the feature extraction network in a region where the annotation box is located; the second feature is used for representing a feature extracted by the feature extraction network in a region outside the annotation box; and on the basis of the second output result, determining that a string-falling component exists in