A light-emitting diode driving device enabling an excellent heat-dissipation function and high-efficient driving is disclosed. The disclosed LED driving device comprises: a power source unit providing an alternate current voltage; a rectification unit communicatively coupled to the power source and rectifying the alternate current voltage; a driving signal generation unit configured to receive the rectified voltage from the rectification unit and generate a primary driving signal by using the rectified voltage; and an LED driving signal modulation unit communicatively coupled to the driving signal generator, the LED driving signal modulation unit configured to receive the primary driving signal and generating a secondary pulse driving signal by modulating the primary driving signal, and LED groups including LEDs and configured to receive the primary driving signal or the second pulse driving signal such that the LED groups operate responsive to the primary driving signal or the secondary pulse driving signal.