The invention relates to a compound microstrip line device for inhibiting the electromagnetic radiation of a double frequency mobile. The device comprises a microstrip line, a patch inductor LL, a patch capacitor CL, a metal receiving plate, a corner microstrip line, a taper microstrip line, a grounding spot, a U shape metal belt and two blocks of external metal conduction tablets. A microwave LC loop is formed by the metal receiving plate, the compound microstrip line of left/right and the grounding spot of the device, which is capable of consuming the excess electromagnetic radiation of the mobile phone, so as to reduce the damage to the brain of mobile phone users. The invention is manufactured by adopting low cost materials like the patch capacitor, the patch inductor, the metal copper sheet conductor and microstrip line. The invention has the advantages of low manufacturing cost, easy assembling and convenient for embedding into the double frequency mobile.