The invention provides an active broadband directional diagram reconfigurable antenna cover. The antenna cover is composed of graphene-cross recess multi-layer active-frequency selective surface units. Each active frequency selection surface unit consists of a pair of patch layers, a pair of dielectric layers A, a pair of dielectric layers B, and a cross recess seam layer is arranged in the middleof the unit and loaded with graphene patches, wherein the pair of patch layers, the pair of dielectric layers A and the pair of dielectric layers B are symmetrically arranged up and down. Through applying a bias voltage between the pair of dielectric layers A and the seam layer, the broadband reflection and transmission switch adjustable state can be realized. The active frequency selection surfaces which are periodically arranged are loaded on the periphery of the omnidirectional antenna to form an N-surface antenna cover. Through controlling transmission switches and adjustable states of different surfaces, the reconfigurable characteristics of multifunctional directional diagrams such as single-beam full-angle scanning, multi-beam scanning and gain continuous adjustment of the antennacan be realized in a broadband range.