The invention discloses an electric power monitoring device with an alarm function. The electric power monitoring device comprises a mounting seat. A moving groove is formed in one side of the mounting seat. A first mounting groove is formed in the inner wall of the side, away from an opening of the moving groove, of the moving groove. A fixed plate is fixedly mounted on the inner wall of the side, away from an opening of the first mounting groove, of the first mounting groove. A pushing rod is mounted on the fixed plate in a sliding manner. A pushing plate is fixedly mounted at the end, closeto the moving groove, of the pushing rod and is located in the moving groove. A rotary motor is fixedly mounted on the inner wall of one side of the first mounting groove. A first gear is fixedly mounted on an output shaft of the rotary motor. A connecting block is fixedly mounted on the pushing rod. A first rack is fixedly mounted at the bottom of the connecting block and is engaged with the first gear. According to the electric power monitoring device, the height and angle of a photographic device can be conveniently adjusted according to actual needs, more use needs of people can be met, the structure is simple, and use is convenient.