The invention discloses a street lamp with a mosquito-killing lamp, which comprises a lamp holder, a lampshade, an illuminating lamp and a supporting rod, and further comprises a mosquito-killing lamp and a supporting tube; the mosquito-killing lamp comprises a casing with a front opening and a rear opening, electric shock meshes, an ultraviolet lamp, a front shade, a rear shade and a mosquito storage box; the front shade and the rear shade are detachably connected with the front opening and the rear opening of the casing respectively, the ultraviolet lamp is arranged on an ultraviolet lamp base inside the casing, the electric shock meshes are arranged at two sides of the ultraviolet lamp, the mosquito storage box is arranged on the casing below the electric shock meshes; one end of the supporting tube is fixedly connected with the casing, the other end of the supporting tube is fixedly connected with the lamp holder, and the upper end of the supporting rod is fixedly connected with the lower end face of the casing. By adopting such a structure, the illuminating lamp can lure mosquitoes to get close to the street lamp based on phototaxis of the mosquitoes, and the ultraviolet lamp of the mosquito-killing lamp can kill the mosquitoes by means of the tendency of the mosquitoes to the light emitted by the ultraviolet lamp, thereby achieving the purpose of illumination and killing mosquito. The street lamp with the mosquito-killing lamp is not only environmentally friendly, but also hygienic.