The invention discloses a street lamp with good protective effect, which comprises a mounting seat, a lamp post is fixedly connected to the top of the mounting seat, a connecting post is fixedly connected to the top of the right side of the lamp post, and the right side of the connecting post is fixed A street lamp body is connected, and support plates are fixedly connected to both sides of the top of the street lamp body, and a rain shield is fixedly connected to the top of the support plate. The present invention is provided with a support plate, a rain shield, a first through slot, a first dust screen, a housing, a second through slot, a second dust screen, a micro blower, an exhaust pipe, an air outlet pipe, a horizontal pipe, The blower cover, fixing bracket, buckle and controller cooperate with each other to achieve the advantages of good protection effect, solve the problem of poor protection effect of existing street lamps, and enable the street lamps to automatically dissipate heat when they are in use, preventing Lufeng from burning out , when the street lamp is used in rainy days, it can be waterproof so as to improve the practicability of the street lamp.