The invention belongs to the field of antenna components or devices combined with antennas and discloses a millimeter wave dielectric resonator MIMO antenna applied to 5G mobile communication. The antenna comprises a radiation structure, a feeding structure, a decoupling structure and a dielectric substrate. The antenna units of the antenna of the present invention realize feeding by means of thecoupling of microstrips and slits; the decoupling structure is composed of metal strips which are formed on the upper surfaces of the antenna units through PCB process etching; the decoupling structure of the antenna of the present invention can improve isolation by disturbing displacement current coupled by one antenna unit from the other antenna unit; and the existence of the decoupling structure does not significantly affect the original impedance matching of the antenna and does not occupy a space between the two antenna units. According to the antenna of the invention, the PCB metal strips are introduced so as to disturb the displacement current coupled from one antenna unit by the other antenna unit, and therefore, isolation between two ports can be improved under a condition that design space is not additionally occupied.