An electric hair clipper with improved blade control structures for adjusting a scissors kit includes a combination housing provides a knob fitting portion, a pivot portion, an axial guiding slot, a motor receiving portion and a motor fixing portion. An adjusting knob provides a knob body and a pivot portion that pivots on the pivot portion of the combination housing, a turning operation portion around the adjusting knob for the finger to fiddle with and a pusher driving portion formed continuous various distance radially from the center of the pivot portion, an elastic orientation part is placed between the knob body and the combination housing. A motor unit is provided in the combination housing. A sliding pusher provides a body; a driven link portion that driven by the pusher driving portion of the adjusting knob to make the sliding pusher slide, a push head can push against the scissors kit.