Denim sizing and desizing method based on instant desizing agent

The invention relates to the field of sizing and desizing of textile technology, and discloses a denim sizing and desizing method based on an instant water desizing agent, which is characterized by comprising the following steps: (1) putting the instant water desizing agent into a mixing device aiming at cotton yarns with the yarn count of 6-16S; (2) the stirring speed of the material mixing device is larger than or equal to 70 r/min; (3) adding 25 kilograms of water, namely the desizing agent, into a mixing device, slowly adding about 700 liters of cold water into the sizing agent, and stirring while feeding; (4) raising the temperature to 50 DEG C, keeping heat preservation and stirring for 20 minutes until the slurry is in a uniform clear soup appearance; according to the method, wet sizing is selected for 6-16S cotton yarn, so that the drying cost is saved; in the desizing process, water is directly used, desizing enzyme is not needed, and the TEGEWA value is 7-9 after hot water desizing. In addition, com