The invention relates to an MIMO antenna with low cross coupling four-unit UWB and belongs to the technical field of wireless communication. The MIMO antenna with low cross coupling four-unit UWB comprises a dielectric slab, four monopole UWB antenna-units and two butterfly-shaped planar EBG structural square matrixes, wherein the 4 antenna units are respectively located on four point angles of the dielectric slab, and are mutually perpendicular to each other, with the entirety being centrosymmetric relative to the centre of the dielectric slab. Furthermore, the EBG structural square matrixes are made up of the new type butterfly sized planar EBG and adopts 6x6 matrix-arranged pattern, respectively on the centre of the front and back sides of the dielectric slab. MIMO antenna with low cross coupling four-unit UWB has the advantages of wide broadband, low cross coupling, simple structure, and is easy to make and integrate and the like, thereby applying to all kinds of minitype mobile terminals.