Yarn doffing device convenient to adjust

The yarn doffing device convenient to adjust comprises a base, and a left side plate and a right side plate are fixedly arranged on the left side and the right side of the base respectively. A cylinder is mounted on the left side plate; the lifting plate is arranged at the output end of the cylinder; a doffing piece is arranged between the upper part of the lifting plate and the upper part of the right side plate; a tensioning adjusting mechanism is arranged on the right side plate and comprises an adjusting sliding block, a lead screw, an adjusting motor and a tensioning plate. A sliding groove is formed in the right side plate, and the adjusting sliding block is inserted into the sliding groove in a sliding mode. A lead screw is vertically arranged on the outer side, corresponding to the sliding groove, of the right side plate, one end of the adjusting sliding block sleeves the lead screw and is in threaded connection with the lead screw, an adjusting motor is fixedly arranged at the other end of the adjust