The invention provides a rectangular forming antenna array. Rectangular forming beams, capable of rapid falling, of a directional diagram can be realized through array layout, amplitude weighting, and phase configuration by employing a few of array units of forming antennas. The rectangular forming antenna array comprises four array units of a first loop, eight array units of a second loop, and four array units of a third loop, and the array units of the three loops are concentric. Therefore, by employing the rectangular forming antenna array, coverage overlapping or dead zones of adjacent multiplexing cells can be effectively eliminated, a better effect of rectangular beam forming is realized, the minor lobe is reduced, the quantity of array units is reduced, miniaturized and low-weight design of the rectangular forming antennas is realized, the rectangular forming antenna array can be better applied to the field of mobile communication etc., and goals of reducing the cost and saving the time can be achieved.