The invention relates to a multi-passage LED driving circuit, comprising an exact current source (30) which can provide exact current, a multi-passage mirror amplification module (40) which is used for amplifying the exact current and copies the amplified current to multi-passage output, and an active output-step (34) which can precisely regulate each passage of output. The embodiment of the multi-passage LED driving circuit can drive the multi-passage LED by one passage of prearranged bias current only, thus saving the power dissipation and having high current conversion efficiency; each passage of output current is independently detected and adjusted, the output current has high match precision, and the active output step structure has large output resistance and strong anti-interference capability.