An antenna array of a mobile terminal and an implementing method thereof are disclosed in this document. The antenna array includes: a mobile terminal floorboard, configured to act as a radiation body to radiate antenna energy coupled by multiple pairs of coupling units, and multiple pairs of coupling units corresponding to multiple antennas, each of which are fixed at two ends of the mobile terminal floorboard and are configured to inspire a waveguide mode of the mobile terminal floorboard to radiate the coupled antenna energy through feed points of feed lines of each coupling unit therein, located at the same side of a dielectric material plate; and a matching circuit located at the other side of the dielectric material plate, connected with the feed points located at the opposite side of the dielectric material plate and configured to implement impedance matching of a micro-strip feed line of each coupling unit.