A modularized street lamp, comprising: a lamp holder, which is mounted to a lamp post and comprising a first socket and a second socket on a surface of the lamp holder; a first light emission module, comprising: a first plate comprising a first surface and a second surface opposite to the first surface; a first illuminant, which is arranged on the first surface of the first plate; and a first plug, which is mounted on the second surface of the first plate and is electrically connected to the first illuminant and is insertable into the first socket to be electrically connected thereto; a second light emission module, which comprises: a second plate comprising a first surface and a second surface opposite to the first surface; a second illuminant, which is arranged on the first surface of the second plate; and a second plug, which is mounted on the second surface of the second plate and is electrically connected to the second illuminant and is insertable into the second socket to be electrically connected thereto; wherein the first light emission module and the second light emission module are respectively coupled to the first socket and the second socket so that the first light emission module and the second light emission module cover different areas of illumination. a lamp holder, which is mounted to a lamp post and comprising a first socket and a second socket on a surface of the lamp holder; a first light emission module, comprising: a first plate comprising a first surface and a second surface opposite to the first surface; a first illuminant, which is arranged on the first surface of the first plate; and a first plug, which is mounted on the second surface of the first plate and is electrically connected to the first illuminant and is insertable into the first socket to be electrically connected thereto; a first plate comprising a first surface and a second surface opposite to the first surface; a first illuminant, which is arranged on the first surface of the first plate; and a first plug, which is mounted on the second surface of the first plate and is electrically connected to the first illuminant and is insertable into the first socket to be electrically connected thereto; a second light emission module, which comprises: a second plate comprising a first surface and a second surface opposite to the first surface; a second illuminant, which is arranged on the first surface of the second plate; and a second plug, which is mounted on the second surface of the second plate and is electrically connected to the second illuminant and is insertable into the second socket to be electrically connected thereto; a second plate comprising a first surface and a second surface opposite to the first surface; a second illuminant, which is arranged on the first surface of the second plate; and a second plug, which is mounted on the second surface of the second plate and is electrically connected to the second illuminant and is insertable into the second socket to be electrically connected thereto; wherein the first light emission module and the second light emission module are respectively coupled to the first socket and the second socket so that the first light emission module and the second light emission module cover different areas of illumination.