A foolproof electrical connector interface system includes a connector male, a connector female, two fixing plates and two junction boxes. The connector male and the connector female are fixed in installing slots of a photovoltaic panel; the fixing plates are provided with positioning columns, first hooks and second hooks; the fixing plates are connected with the photovoltaic panel, and then the connector male and the connector female are respectively fixed between the first hooks and between the second hooks; the connector male and the connector female are electrically connected by a wire; the connector male is provided with a male plug; the male plug is provided with a bump; the connector female is provided with a female plug; the female plug is provided with a groove; the junction boxes are waterproof junction boxes; the junction boxes are respectively electrically connected with the connector male and the connector female through wire.