An antenna array of a mobile terminal, comprising a mobile terminal floorboard and multiple pairs of coupling units (3,4) located at a same side of a dielectric material plate, and a matching circuit located at another side of the dielectric material plate, wherein: the mobile terminal floorboard is configured to: act as a radiation body to radiate antenna energy coupled by multiple coupling units; the matching circuit is connected with feed points located at the other side of the dielectric material plate, and the matching circuit is configured to: implement impedance matching of the feed lines of each coupling unit, each pair of coupling units include two coupling units, and each coupling unit is configured to: generate a waveguide mode of the mobile terminal floorboard to radiate the coupled antenna energy through feed points of feed lines of each coupling unit, characterised in that the two pairs of coupling units are respectively fixed at two ends of the mobile terminal floorboard, wherein, each pair of coupling units is fixed at front and rear ends and/or top and bottom ends of the mobile terminal floorboard through the feed points of the feed lines of each of the two coupling units of each pair of coupling units, each coupling unit is a vertically folded rectangular metal patch, and the two coupling units in each pair of coupling units are configured to operate in a same frequency range, corresponding to a low-frequency range or a high-frequency range, and are placed in diagonal positions of the mobile terminal floorboard, wherein a coupling unit corresponding to the low-frequency range is a first coupling unit, and the first coupling unit comprises a first long side, a first short side, a first broad side and a first horizontal spacing of the first coupling unit exceeding the mobile terminal floorboard; a coupling unit corresponding to the high-frequency range is a second coupling unit, and the second coupling unit comprises a second long side, a second short side, a second broad side and a second horizontal spacing of the second coupling unit exceeding the mobile terminal floorboard; a spacing exists between the first coupling unit and the second coupling unit located at the same side and the feed points of feed lines of the first coupling unit and feed points of feed lines of the second coupling unit are respectively located at the dielectric material plate. the mobile terminal floorboard is configured to: act as a radiation body to radiate antenna energy coupled by multiple coupling units; the matching circuit is connected with feed points located at the other side of the dielectric material plate, and the matching circuit is configured to: implement impedance matching of the feed lines of each coupling unit, each pair of coupling units include two coupling units, and each coupling unit is configured to: generate a waveguide mode of the mobile terminal floorboard to radiate the coupled antenna energy through feed points of feed lines of each coupling unit, characterised in that the two pairs of coupling units are respectively fixed at two ends of the mobile terminal floorboard, wherein, each pair of coupling units is fixed at front and rear ends and/or top and bottom ends of the mobile terminal floorboard through the feed points of the feed lines of each of the two coupling units of each pair of coupling units, each coupling unit is a vertically folded rectangular metal patch, and the two coupling units in each pair of coupling units are configured to operate in a same frequency range, corresponding to a low-frequency range or a high-frequency range, and are placed in diagonal positions of the mobile terminal floorboard, wherein a coupling unit corresponding to the low-frequency range is a first coupling unit, and the first coupling unit comprises a first long side, a first short side, a first broad side and a first horizontal spacing of the first coupling unit exceeding the mobile terminal floorboard; a coupling unit corresponding to the high-frequency range is a second coupling unit, and the second coupling unit comprises a second long side, a second short side, a second broad side and a second horizontal spacing of the second coupling unit exceeding the mobile terminal floorboard; a spacing exists between the first coupling unit and the second coupling unit located at the same side and the feed points of feed lines of the first coupling unit and feed points of feed lines of the second coupling unit are respectively located at the dielectric material plate.