The invention provides a rear outgoing line positioning structure for a connector, and the structure comprises a positioning block. The bottom of the positioning block extends outwards out of an extension plate, and the extension plate is provided with positioning holes. The number and positions of the positioning holes are corresponding to the number and positions of at least one row of welding pins at one side of an interface connector. A side part of the positioning block is provided with an installation screw hole, and the positioning block is inserted on the row of welding pins at one side of the interface connector through the positioning holes, and then the installation screw hole of the positioning block coincides with the installation hole at an opposite position on a mother board, and the positioning block can be fixed through a fixing device. The shape of the inner side of a side part of the positioning block is matched with the shape of an outer side of a lead connector connected with the interface connector. The structure has a fastening function, and the lead connector can be fixed with the mother board through the positioning block to form a body. Moreover, the shapeof the inner side of the positioning block is matched with the shape of the outer side of the lead connector, so the structure can achieve the guide of the connection of the lead connector with the interface connector.