The invention discloses a modularized street lamp which comprises a lamp post and a lamp cap arranged on the lamp post. The lamp cap comprises a framework, a plurality of LED (light-emitting diode) module units rotatably arranged on the framework, and at least one photosensor arranged on the framework. A rotary connector is arranged on the framework; the rotary connector is also connected with the lamp post; the framework rotates vertically along a rotary part; the LED module unit is provided with an independent radiating part; the photosensor is connected with one LED control module; and the LED control module is contained in the framework. As the LED module units of the modularized street lamp are provided with the independent radiating parts, which can be sufficiently contacted with air to effectively transfer heat and radiate automatically, the modularized street lamp has excellent radiating performances; and the respective sealing and waterproof performances of the LED modules are integrally good. Besides, the angles of the LED module units can be independently adjusted to lead the illumination to be more uniform.