The invention discloses an environment-friendly and adjustable street lamp capable of dust suction. The street lamp comprises a lamp pole, wherein a driving cavity is formed in the lamp pole, a speedreducing motor is arranged on the inner bottom wall of the driving cavity, a rotating rod is fixedly connected to an output end of the speed reducing motor, an end, away from the speed reducing motor,of the rotating rod penetrates through the inner top wall of the driving cavity and extends above the lamp pole; the top of the lamp pole is provided with a dust suction box, the top end of the rotating rod is fixedly connected with the bottom surface of the dust suction box; and annular sliding grooves are formed in the upper surface of the lamp pole, sliding rods are fixedly connected to the bottom surface of the dust suction box, the bottom end of each sliding rod penetrates into the inner part of corresponding annular sliding groove, driven rods are fixedly connected to the bottom end ofeach sliding rod, rollers are arranged on the outer surface of corresponding driven rod in a sleeved mode, the upper surface of each roller is in contact with the inner top wall of corresponding annular sliding groove, and sliding rails are fixedly connected to the inner wall of the dust suction box. The environment-friendly and adjustable street lamp capable of dust suction has the advantages ofbeing capable of angle adjustment and dust suction.