Doubling machine capable of improving spinning quality

The utility model belongs to the technical field of spinning devices, particularly relates to a doubling machine capable of improving spinning quality, and aims to solve the problems that an existing take-up roller is rotationally connected between two mounting parts, after the surface of the take-up roller is fully wound with plied yarns, the take-up roller is inconvenient to disassemble and replace, the workload is increased, and the working efficiency is reduced. The device comprises a base; the top end of the base is fixedly connected with a first fixing plate, and the doubling assembly is arranged on one side of the first fixing plate and used for merging yarns; a third fixing plate is fixedly connected to the top end of the base, the second rotating shaft is rotationally connected into the third fixing plate and used for containing a material collecting roller, a set of positioning assemblies are arranged in the second rotating shaft, and the positioning assemblies are used for fixing the material colle