According to the current development trend of wireless communication systems, in order to significantly improve the efficiency of communications. a low coupling multiple-input multiple-output antenna based on split ring resonator and complementary split ring resonator is designed for Ka-band. The overall dimensions of the antenna are 40 mm×25 mm×1.2 mm. First, the front side of the antenna consists of an elliptical radiating patch with a hollow circle, trapezoidal microstrip feedline and split ring resonator, to ensure that the antenna operates in the Ka-band(26~40 GHz). Second, on the back is a rectangular ground plate with a complementary split ring resonator, which can effectively achieve the purpose of decoupling. Thus realizing the effect of low coupling. Simulated and measured results show that, operating bandwidth of 26~40 GHz（the relative bandwidth of 50%）, return loss less than -10 dB, coupling less than -26 dB, envelope correlation coefficient is less than 0.001, good radiation directional map, stable gain, high radiation efficiency. As a result, the designed antenna not only has a simple structure, compact size and wide frequency coverage, but also has superior performance. it can be widely used in 5G millimeter-wave related areas. In summary, the application of SRR/CSRR has led to the reduction of the mutual coupling of millimeter-wave MIMO antenna, the feasibility and effectiveness of the SRR/CSRR technique as a novel decoupling technique are verified.