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This invention belongs to the field of electrochemical technology and relates to a high-voltage resistant composite positive electrode sheet and its preparation method for suppressing gas generation during battery cycling. The composite positive electrode sheet includes a positive electrode sheet and a polymer coating on the active material layer of the positive electrode sheet. The polymer coating is a composite polymer coating formed by in-situ copolymerization of phosphorus-containing monomers and fluorinated acrylate monomers in the presence of polyethylene glycol borate under ultraviolet light. The mass ratio of the phosphorus-containing monomers, fluorinated acrylate monomers, and polyethylene glycol borate is (3~4):1:(0.15~0.4). The composite positive electrode sheet of this invention can suppress gas generation during battery cycling and improve its high-voltage resistance (≥4.3V vs Li). + / Li) stability.