Automatic focusing control system for electric lens of digital camera

The invention discloses an automatic focusing control system for an electric lens of a digital camera. The automatic focusing control system is characterized by comprising an electric lens part and a digital camera part, wherein the optical imaging signal output end of an optical lens in the electric lens part is connected with the signal input end of an image sensor in the digital camera; a motor in the electric lens part is connected with the optical lens; the electronic imaging signal output end of the image sensor in the digital camera part is connected with the signal input end of a central processor; and the signal output end of the central processor is connected with the signal input end of the motor in the electric lens part. The automatic focusing control system has the advantages that: automatic focusing of a uniform electric lens is realized by a standard RS-485 focusing control motor; a precise, real-time and automatic focusing function can be realized easily by upgrading a camera firmware without changing hardware and functions of the standard electric lens in the market and modifying a hardware design of the camera; the precision is improved and the cost is reduced; and the automatic focusing control system is in accordance with an intelligent tendency of development of the digital camera.