The utility model discloses an improved reeled yarn mercerization machine, and the machine is characterized in that the machine includes a hydraulic tension mechanism, an alkali groove elevating mechanism, a roller lifting mechanism, a pressure roller mechanism, a water tank dragging mechanism, a roller rotating mechanism and a control system. The water tank dragging mechanism is driven by a frequency conversion and speed regulation motor, and the control system includes an industrial computer and a programmable controller. The quality of the machine is improved, and the main performance index and the technology capacity are greatly improved.