The invention discloses a multimode, broadband and ultrahigh-frequency anti-metal tag array antenna and an impedance separation and matching method. The anti-metal tag array antenna comprises a top layer radiating body, a middle layer radiating body, a bottom layer radiating body, as well as an upper substrate and a lower substrate which are connected in a superimposition manner, wherein the upper surface of the upper substrate is coated with the top layer radiating body; the lower surface of the upper substrate is coated with the middle layer radiating body; the lower surface of the lower substrate is coated with the bottom layer radiating body; the top layer radiating body comprises two oppositely arranged E-shaped parts; a tag chip is connected between the two E-shaped parts; the middle layer radiating body comprises four sub-antenna arrays in reversed-F-shaped structures; each sub-antenna is provided with a narrow groove; a plurality of upper through holes and lower through holes are formed in the upper substrate and the lower substrate respectively; inner walls of the upper through holes and the through holes are coated with connecting parts respectively; the top layer radiating body is communicated with the bottom layer radiating body by the connecting parts of the inner walls of the upper through holes and the lower through holes; each sub-antenna is communicated with the bottom layer radiating body by the connecting part of the inner wall of each corresponding lower through hole.