The invention discloses a street illuminating lamp convenient to maintain and replace. The street illuminating lamp comprises a main supporting column, a winding device is fixed at the upper end of the main supporting column, wherein the winding device comprises a winding rolling shaft, and supporting frames are symmetrically fixed at the two ends of the winding rolling shaft; two fastening devices are fixed on one side of the main supporting column, and each fastening device comprises a fixed shell, clamping springs are uniformly fixed inside the fixed shell, a fastening nut is fixed to one end of the fastening device in a threaded mode, the end, deviating from the fastening nut, of the fixed shell is fixedly provided with a connecting plate, and fixing nuts are fixed to the two ends of the connecting plate in a threaded mode; and a lamp pole is clamped in the fastening devices in a clamped mode, wherein a rotating shaft is rotationally installed at the bottom part of the lamp pole, an illuminating lamp body is fixed at the upper end of the lamp pole, and a connecting block is fixed at the end, deviating from the illuminating lamp body, of the upper end of the lamp pole. The street illuminating lamp has the advantages that maintenance and replacement of the illuminating lamp is convenient, and manpower and maintenance replacement time are greatly saved.