A photovoltaic array structure having low line loss, comprising several photovoltaic modules as photovoltaic array units, wherein each photovoltaic module comprises one photovoltaic cell string or a plurality of photovoltaic cell strings distributed row by row or column by column and connected in series and/or in parallel, and the photovoltaic module comprises a long side and a short side, a first end edge junction box and a second end edge junction box being arranged on light-facing surfaces or surfaces facing away from light at two ends along a center line of the long side of the photovoltaic module respectively, and being located on the same side of the long side of the photovoltaic module, the junction boxes being electrically connected by means of bus bars, and the first end edge junction box and/or the second end edge junction box being electrically connected to end edge junction boxes of the photovoltaic module adjacent to the first end edge junction box and/or the second end edge junction box by means of cable connectors respectively, characterized in that said photovoltaic array structure further comprises an A-type photovoltaic module column formed by connecting at least two A-type photovoltaic modules in series and a B-type photovoltaic module column formed by connecting at least two B-type photovoltaic modules in series, the A-type photovoltaic module column and the B-type photovoltaic module column being connected to each other in series and arranged on a mounting base surface by using alternating structures arranged in parallel; wherein the A-type photovoltaic module column comprising an A-type positive output terminal located at one end and an A-type negative output terminal located at the other end; the B-type photovoltaic module column comprising a B-type positive output terminal located at one end and a B-type negative output terminal located at the other end; the A-type positive output terminal being located at the same end as the B-type negative output terminal, and the A-type negative output terminal being located at the same end as the B-type positive output terminal; and the A-type negative output terminal being electrically connected to the B-type positive output terminal of the B-type photovoltaic module column adjacent to the A-type negative output terminal by means of the cable connector. being located on the same side of the long side of the photovoltaic module, the junction boxes being electrically connected by means of bus bars, and the first end edge junction box and/or the second end edge junction box being electrically connected to end edge junction boxes of the photovoltaic module adjacent to the first end edge junction box and/or the second end edge junction box by means of cable connectors respectively, characterized in that said photovoltaic array structure further comprises an A-type photovoltaic module column formed by connecting at least two A-type photovoltaic modules in series and a B-type photovoltaic module column formed by connecting at least two B-type photovoltaic modules in series, the A-type photovoltaic module column and the B-type photovoltaic module column being connected to each other in series and arranged on a mounting base surface by using alternating structures arranged in parallel; wherein the A-type photovoltaic module column comprising an A-type positive output terminal located at one end and an A-type negative output terminal located at the other end; the B-type photovoltaic module column comprising a B-type positive output terminal located at one end and a B-type negative output terminal located at the other end; the A-type positive output terminal being located at the same end as the B-type negative output terminal, and the A-type negative output terminal being located at the same end as the B-type positive output terminal; and the A-type negative output terminal being electrically connected to the B-type positive output terminal of the B-type photovoltaic module column adjacent to the A-type negative output terminal by means of the cable connector.