An LED driving system with power transmission path coincided with data transmission path, having a plurality of LED driving chips, each having a main input end, a main output end, a logic control module, an RGB gray adjustment module, a power supply module, a voltage clamping module, a digital signal extraction module and a signal processing module. The input end of the voltage clamping module is connected with the main output end of the previous LED driving chip, the output end is connected with the main input end of the next LED driving chip The main input end of the LED driving chip is connected with the digital signal extraction module, which then connects with the signal processing module whose output end is connected with the logic control module which has an output end connected with the RGB gray adjustment module.
