A fixing structure of battery module for fixing a battery module in an electronic device is proposed. The fixing structure includes a first lid and a second lid, which are formed on a surface of the electronic device, wherein the first lid is formed with a first fastening part, and the second lid is formed with a second fastening part for being engaged with the first fastening part; a mounting cavity formed in the electronic device at a position corresponding to the second lid; a first locking part formed on the second lid; and a second locking part formed on the battery module, for being coupled to the first locking part so as to fasten the battery module to the second lid. When the first and second lids are coupled together by the first and second fastening parts, the battery module fastened to the second lid is received in the mounting cavity and fixed in the electronic device.