The invention provides a one-dimensional wide-angle scanning phased array based on a rectangular patch TM20 mode, and relates to the technical field of microwave antennas. The structure of the phasedarray provided by the invention is mainly composed of an array antenna patch, a feeding part and a dielectric substrate, and the array is composed of 8 identical units arranged at equal intervals. Since the performance of the phased array has a great relationship with the array units, the invention makes an improvement based on the rectangular patch TM20 mode, expands the unit beam, and further broadens the phased array scanning range. Under the premise of ensuring the same polarization in the scanning process, through miniaturization technology, the unit size is reduced, the unit spacing is increased to a certain extent, the mutual coupling effect among the units is reduced, and a good impedance matching effect in the beam scanning process is ensured.