The invention discloses a multifunctional solar street lamp. The multifunctional solar street lamp comprises a lamp pole, wherein the lamp pole is provided with a box body; an outer surface of the boxbody is fixedly provided with a square transparent glass cover; an installation space is arranged between the transparent glass cover and the box body; a cover body is arranged on the lamp pole rightabove the box body; a threaded section is arranged on the lamp pole right above the transparent box body; four groups of auxiliary compressing mechanisms acting on an advertisement leaflet are uniformly arranged in an array in the installation space in the circumferential direction of the transparent glass cover; the auxiliary compressing mechanism comprises a pair of support plates fixedly arranged on the side walls of the box body and located at two ends close to an upper part; a support shaft is slidably arranged between the two support plates; two ends of the support shaft are respectively and slidably embedded in the two support plates through a connecting rod; an electromagnet attracting the connecting rod is respectively arranged on two ends in the support plates extending in the longitudinal direction; four groups of auxiliary posting devices acting on the advertisement leaflet are uniformly arranged in an array in the installation space. The effect of posting the advertisement on the solar street lamp is reasonably implemented, and the functionality of the solar street lamp is improved.