Adjustable limiting mechanism used for yarn bobbin and capable of preventing yarn from disengaging

The utility model relates to the technical field of yarns, in particular to an adjustable limiting mechanism capable of preventing yarns from separating for a yarn bobbin, which comprises a base, two sliding grooves are arranged on the upper surface of the base, two symmetrical support plates are arranged above the base, limiting discs are welded and fixed on the inner surfaces of the support plates, two sliding blocks are welded and fixed on the lower bottom surfaces of the support plates, and the two sliding blocks are fixed on the upper surface of the base. A yarn bobbin is placed between the two supporting plates, a user holds the rotating handle with one hand, the fixing rod at one end of the rotating handle sequentially penetrates through one of the supporting plates and the limiting disc, then the yarn bobbin between the two supporting plates is strung on the fixing rod, and the yarn bobbin is fixed through the fixing rod. When the yarn cylinder is used, one end of the fixing rod penetrating through th