The invention discloses an OCA optical adhesive easy to attach. The OCA optical adhesive comprises the following components in parts by mass: 20 parts to 45 parts of hydroxypropyl methacrylate, 40 parts to 50 parts of glycidyl methacrylate, 6 parts to 20 parts of 2-ethylhexyl acrylate, 2 parts-6 parts of benzene polyacid ester, 1 part-4 parts of hydroxybenzophenone, 1 part-5 parts of phthalic acidester, 1 part-5 parts of hydroquinone, 1 part-5 parts of ethyl acetate, 0.5 part-1 part of an initiator, 0.2 part-0.5 part of polyethylene glycol dimethacrylate, 0.2 part-0.5 part of a sensitizer, 0.5 part-1 part of a crosslinking agent, 1 part-3 parts of a surface modifier and 1 part-5 parts of polysiloxane. According to the OCA optical adhesive easy to attach, the surface of a screen is comprehensively filled with 2-ethylhexyl acrylate, and bubbles generated when an OCA optical adhesive product is attached are eliminated; moreover, by adding the surface modifier and polysiloxane, the surface tension of the OCA optical adhesive is reduced, air between the OCA optical adhesive and the screen can be extruded during OCA optical adhesive pasting, the bubble amount is reduced, and the productquality is improved.