Reliably-welded solar photovoltaic assembly junction box

The invention relates to a reliably-welded solar photovoltaic assembly junction box. The reliably-welded solar photovoltaic assembly junction box comprises a junction box body, wherein a metal sheet leading-out wire is arranged in the junction box body; a groove is formed in the metal sheet leading-out wire; and welding spots are arranged in the groove. When the output end of a solar cell is required to be welded with the metal sheet leading-out wire, the fused welding spots are arranged in the grooves and do not flow along the metal sheet leading-out wire so that the welding spots are fully welded on welding bands. Therefore, the output end of the solar cell is fixedly connected with the metal sheet leading-out wire; and the situation about insufficient welding and falling off the welding spots can be avoided so that circuit connection can be more reliable.