perspective view showing a first light emission module or a third light emission module according to the present invention fig6 is another perspective view of the first light emission module or the third light emission module according to the present invention taken from another angle fig7 is a perspective view showing a second light emission module or a fourth light emission module according to the present invention fig8 is another perspective view of the second light emission module or the fourth light emission module according to the present invention taken from another angle and fig9 is a schematic side elevational view illustrating extension of the lamp holder according to the embodiment of the present invention as shown in fig1 8 the present invention provides a modularized street lamp which comprises a lamp holder 10 a first light emission module 30 and a second light emission module 40 the lamp holder 10 is mounted to a lamp post 20 and comprises a first socket 11 and a second socket 12 referring to fig5 and 6 the first light emission module 30 comprises a first plate 31 a first illuminant 32 and a first plug 33 the first illuminant 32 is arranged on one surface of the first plate 31 the first plug 33 is mounted to the first plate 31 and.