The invention discloses a glycerol trilaurate-containing modified silanization metal surface pretreatment agent. The glycerol trilaurate-containing modified silanization metal surface pretreatment agent comprises the following components in parts by weight: 100 of deionized water, 10-15 of modified coupling agent, 10-15 of ethanol, 30-40 of vinyl-tris(beta-methoxy-ethoxy)silane, 20-30 of vinyl triethoxysilane, 1-2 of dicumyl peroxide, 0.002-0.003 of perfluorooctanesulfonic acid sodium salt, 0.3-0.5 of tree ashes, 4-6 of epoxy resin emulsion, 2-3 of carboxymethyl cellulose sodium, 0.4-1.0 of glycerol trilaurate, 0.2-0.6 of polyoxyethylene oleate, 0.005-0.01 of lanthanum acetate, and 0.1-0.3 of phytic acid. The final glycerol trilaurate-containing modified silanization metal surface pretreatment agent is prepared by modifying through a coupling agent, compounding, adding auxiliaries for distribution, mixing and reacting. The modified silanization metal surface pretreatment agent has the characteristics of being non-toxic and environment-friendly, convenient to use, compact and even for silane membranes, strong in bonding force, and good in corrosion resistance property.