Cured sealing adhesive and preparation method thereof

The invention discloses a preparation method of a cured sealing adhesive, which comprises the following steps: stirring a base polymer and rubber particles under a dehydration condition for 3 hours, and cooling to room temperature to obtain a mixture A; adding a dehydrating agent, and stirring in vacuum for 20-30 minutes to obtain a mixture B; adding a coupling agent, and stirring in vacuum for 20-30 minutes to obtain a mixture C; and adding a catalyst, carrying out vacuum stirring for 20-30 minutes, and carrying out sealed storage to obtain the cured sealing adhesive. The invention also discloses the cured sealing adhesive. The water content of the cured sealing adhesive is strictly controlled, the performance stability and storage performance of the cured sealing adhesive are greatly improved, the deep curing speed is high, the cured sealing adhesive can be immediately packaged after being coated on a sealed piece by virtue of weak adhesion of the surface of the cured sealing adhesive and can also be packag