The invention aims to provide an intelligent focusing system capable of avoiding lens blur of a projector caused by a long-term operation of the projector, and the intelligent focusing system can ensure a long-term stable operation and a clear projection image of the projector. The intelligent focusing system comprises a temperature detection module, a CPU, an intelligent focusing module, and a focusing motor, wherein the temperature detection module is used for monitoring the temperature in the projector shell in real time; when the temperature in the projector shell reaches a certain temperature value in a temperature value list, the temperature detection module sends the temperature value to the CPU; the input end of the CPU is connected with the temperature detection module; the CPU generates a control instruction according to the received temperature value, and outputs the control instruction to the intelligent focusing module; the input end of the intelligent focusing module is connected with the CPU; the intelligent focusing module generates a regulating signal to the focusing motor according to the received control instruction; the input end of the focusing motor is connected with the intelligent focusing module; and the focusing motor regulates the position of a lens group according to the regulating signal so as to realize the focusing function of the projector.