The invention relates to a methyl acrylate pressure-sensitive adhesive for an LCD polarizer and a preparation method thereof, which belong to the technical field of tackiness agent. The pressure-sensitive adhesive comprises the following three materials with the quality shares: a. weight average molecular weight Mw is 100000-2000000, dispersion degree Mw/Mn is 4-20 acrylate copolymer 100 shares, b. coupling agent, c. cross linker 0-15 shares, the comonomer of prepared acrylate copolymer comprises two parts: 1. (methyl) acrylate monomer : 90%-99.5%, 2. functional monomer: 0.5%-10%, wherein the functional monomer is one or several of (methyl) acroleic acid and (methyl) acroleic acid hydroxy ethyl, (methyl) acroleic acid hydroxypropyl acrylate, itaconic acid, acrylamide, N-hydroxymethyl acrylamide and maleic anhydride. The methyl acrylate pressure-sensitive adhesive does not contain elasticizer or low-molecular-weight acrylate copolymer and the like, can reach the use requirement without cross linker under the condition that the requirement to sticking property is low, and the glue layer has better stress relaxation property, and pressure-sensitive adhesive initial adhesion and stripping strength are both extremely ideal.