The invention relates to the field of street lamp erection, in particular to a street lamp erecting method. According to the street lamp erecting method provided by the invention, the fixing intensity of a lamp pole can be effectively improved by installing a support frame on the lamp pole, the support frame achieves a support effect when the lamp pole inclines, the contact area between the lamp pole and a soil layer is increased, and the fixation of the lamp pole is reliable; and the support frame and the lamp pole are fixed by directly adding soil into a foundation pit, so compared with the prior art adopting a concrete casting method, the street lamp erecting method has the advantages that the construction period is greatly shortened, the soil can be directly added without the need of waiting for the concrete solidification, and the street lamp erection cost is reduced.