Double-layer needle cylinder

The invention belongs to the technical field of textile equipment accessories, and provides a double-layer needle cylinder which comprises an inner-layer needle cylinder body, an outer-layer needle cylinder body and an insertion piece. The inner-layer needle cylinder and the outer-layer needle cylinder are annular needle cylinders, the inner-layer needle cylinder and the outer-layer needle cylinder form a concentric circle structure, the inner-layer needle cylinder and the outer-layer needle cylinder are arranged in parallel, the height of the inner-layer needle cylinder is larger than that of the outer-layer needle cylinder, and the inner-layer needle cylinder and the outer-layer needle cylinder are fixed through the insertion piece. The two-layer annular needle cylinder serves as a core component of the weft knitting machine and completely subverts the knitting function of the weft knitting machine, the two-layer annular needle cylinder has different spatial dimensions, and complex multi-layer knitted fabri