The invention discloses an intelligent street lamp and a control method thereof and a wireless network system constructed thereby, and belongs to the technical field of intelligent networking. The intelligent street lamp comprises a lamp cap and a lamp holder, wherein the lamp cap comprises an embedded CPU, a lighting source, a power management module, a lighting control module, a lighting fault detecting module, a camera module, a first wireless communication module, a second wireless communication module, a first antenna, a second antenna, a third wireless communication module, an internal memory and flash module, a hard disk, a traffic sensor module, an encrypting and decrypting module, a smoke detector module, a human body moving infrared sensor module and an alarm module, wherein the power management module, the lighting control module, the lighting fault detecting module, the camera module, the first wireless communication module, the second wireless communication module, the first antenna, the second antenna, the third wireless communication module, the internal memory and flash module, the hard disk, the traffic sensor module, the encrypting and decrypting module, the smoke detector module, the human body moving infrared sensor module and the alarm module are respectively connected with the embedded CPU. The invention further provides the control method of the intelligent street lamp and the wireless network system constructed by the intelligent street lamp. The intelligent street lamp can be automatic to light and intelligently managed; the video monitoring enables security protection; the network can be used through the WiFi; therefore, a small-cost construction implementation scheme is provided for urban information construction.