The invention relates to the field of tool machining, in particular to a multilayer woodworking milling cutter with the adjustable depth. The multilayer woodworking milling cutter comprises a fixing rod, connecting devices and blades. The fixing rod is a cylinder, and the top view of the fixing rod is square. The N connecting devices are sequentially arranged on the fixing rod. Each connecting device comprises a rotary wheel, a center groove and connecting strips, wherein the rotary wheel is cylindrical, the center groove is formed in the center of the rotary wheel, and the four connecting strips are rotationally arranged on the rotary wheel. Each blade comprises a tool handle and a tool bit. Multiple small holes are formed in each tool handle, the tool handles are fixed to the connecting strips through bolts and studs, and the tool bits are fixedly connected to the tool handles. The blades are fixed through the connecting strips, so that the cutting depth is adjusted. The blades are convenient to replace, so that the machining cost is reduced. Different patterns can be formed by changing the positions of the blades, so that diversity is improved.