The invention discloses an acrylic acid series copolymer-based adhesive sheet for a fifth generation (5G) antenna manufacturing process. The adhesive sheet includes an acrylic acid series copolymer and the acrylic acid series copolymer is composed of the following components according to parts by weight: 50-70 parts of iso-octyl acrylate, 10-20 parts of ethyl acrylate, 1-5 parts of hydroxyethyl acrylate, 2-6 parts of acryloyl morpholine, 3-6 parts of methyl acrylate, 10-20 parts of methoxy polyethylene glycol methacrylate, 0.1-0.5 part of azodiisobutyronitrile, and 150-200 parts of a solvent.The acrylic acid series copolymer of the invention can effectively improve the bonding performance and temperature resistance of the adhesive sheet to components of a 5G antenna and well control the high-speed stripping forces before and after undergoing high temperature and high humidity and has no pollution to an object to which the adhesive sheet is adhered.