According to the requirements for ultra-wideband transmission in communication systems, a high isolation dual band-notched ultra-wideband(UWB)multiple-input-multiple-output(MIMO)slot antenna with coplanar waveguide(CPW)feed was designed in this paper. The antenna printed on a FR4 dielectric substrate consists of two orthogonally placed radiation patches, which are a gradual structure combining rectangular and semicircle shapes. The interferences of WLAN and X-band were suppressed by etching C-slot on the radiation patch and loading SRR branch on the back of the radiation patch. The isolation of the proposed MIMO antenna is improved by introducing a fence-shaped branch. The measured results show that the operating bandwidths of the antenna is 3.0-10.66 GHz，the port isolation(S21)within this range is less than -27 dB. The antenna has notched-band characteristics at 5.11-5.96 GHz and 6.82-7.86 GHz. The envelope correlation coefficient(ECC)is less than 0.03. The antenna can be applied to the UWB MIMO communication systems requiring suppression of interference from multiple narrowband signals.