The invention discloses a high-strength milling cutter fixing sleeve device. The high-strength milling cutter fixing sleeve device comprises fixing bolts, a receiving groove, a rotating shaft, a powerhandle, a fixing block, a first connecting block, a second connecting block, a first clamping block, a second clamping block, a cutter handle, a cutter head, a chip removal groove, side edges, end edges, a second clamping groove, a first clamping groove, a first threaded hole and a second threaded hole. The cutter handle is clamped by the first and second clamping blocks. A certain gap is formedbetween the first and second connecting blocks so that the stressed area between the cutter handle and the fixing device is increased, milling cutter stability is improved and the milling cutter is prevented from falling off in work. The fixing bolts are connected to the first and second clamping blocks through threads. The powder handle is rotatingly connected to the fixing bolts so that millingcutter is easy to fix and dismantle and work efficiency is improved.