The invention discloses an LED driving device having stepless dimming control for a lamp and high power factor. The LED driving device comprises an input filtering module (1), a bridge type rectification module (2), a DC conversion module (3), an adjustable light driving module (4) and an LED light source module (5) which are connected in turn. The LED driving device also comprises a wireless communication module (6) which outputs different PWM waves to the enabling end of the adjustable light driving module (4). The adjustable light driving module (4) adjusts current flowing through the LED light source module (5) according to the PWM waves. The LED driving device has high efficiency and low cost.