The invention discloses an antenna electromagnetic wave isolation device and method and relates to the technical field of artificial electromagnetic material and antenna decoupling. The designed isolation device is a metal circuit structure disposed on a dielectric substrate. The metal circuit structure and the dielectric substrate constitute a magnetic metamaterial that is configured to isolate electromagnetic waves. The antenna electromagnetic wave isolation device of the invention is compact and simple in structure, and is integrated between microstrip antennas with severe electromagnetic interference to isolate high-order harmonic waves between the antennas. The isolation device designed by the invention is simple in structure and small in occupied space, uses very mature and low-costtechnology in the preparation process, and is convenient for large-scale design and manufacture.