Retinochoroidal neovascularization (NV), involved in macular degeneration, diabetic retinopathy, and other ocular diseases, causes vision impairment and blindness. Current treatments rely on repeated intraocular injections of anti-angiogenic drugs, which are burdensome for patients and clinicians, and some patients fail to respond to the treatments. This study investigates the potential of mRNA vaccination to mitigate NV and treat ocular pathologies. The vaccine targets leucine-rich alpha-2-glycoprotein 1 (LRG1), a protein specifically expressed in pathological neovascularization, inducing anti-LRG1 antibody responses in mice. In a laser-induced NV model, the LRG1 mRNA vaccine reduces NV area and leakage while inhibiting microglial cell infiltration. Histological analysis shows no adverse effects on retinal architecture or glial cell activation. Additionally, in Vldlr knockout mice, LRG1 mRNA administration suppresses ongoing neovascularization and downregulates key angiogenic mediators. These findings highlight the therapeutic potential of LRG1 mRNA as a novel strategy for CNV-associated diseases.