Environment-friendly street lamp

The invention provides an environment-friendly street lamp. The environment-friendly street lamp comprises a lamp post; the lamp post is sleeved with a purification barrel; the inner wall of the purification barrel is provided with an annular connection part which sleeves the lamp post and is fixedly connected with the lamp post in a sealed mode; the purification barrel is divided into an upper cavity and a lower cavity by the connection part, and the upper cavity communicates with the lower cavity through a through hole; the upper cavity is internally provided with a motor and an annular fanblade, the fan blade is axially connected with the lamp post, and the motor can drive the fan blade to rotate through a transmission mechanism; the side wall of the purification barrel is provided with air inlet holes; the lamp post is further sleeved and fixedly connected with a first sealing ring and a second sealing ring in a sealed mode, and the upper port and the lower port of the purification barrel are sealed throu