A modularized LED lighting system comprising combinations of a control module, a power module and at least one LED light module is provided, wherein two adjacent modules are detachably connected with a connection unit. A novel design uses a single power module and a control module for transmitting a power or a power and a control signal to one or a plurality of LED light module with one or a plurality of connection units detachably and remotely connecting the LED light modules. Alternatively the control module can be integrated with at least the power module or can be integrated with at least the LED light module to become at least a two-module modularized lighting system. The system installation is simplified and the designs are coordinated with advantages such as fast assembly, saving assemble time, saving effort, a neat appearance, no wire entanglement, and flexibility of extending lighting range.