The invention discloses a folding mobile communication device, which comprises a first medium substrate, a first ground plane, an antenna component, a second medium substrate, a second ground plane, a metal wire and a band rejection circuit, wherein the first ground plane is positioned on the surface of the first medium substrate; the antenna component is adjacent to the first ground plane, and is electrically connected to a signal source positioning on the first medium substrate; the second ground plane is positioned on the surface of the second medium substrate, and is electrically connected to the first ground plane by the metal wire; the band rejection circuit is positioned on the first or second ground plane, and comprises a slit, a capacitor component and an inductor component; the slit is adjacent to the metal wire; the capacitor component strides over the slit, and the two ends of the capacitor component are electrically connected to the two sides of the slit respectively; the inductor component strides over the slit, and forms a parallel circuit with the capacitor component, so that the band rejection circuit generates parallel resonance at given frequency; and the two ends of the inductor component are electrically connected to the two sides of the slit respectively. The folding mobile communication device reduces the influence of the ground planes of a system on built-in antennae.