The invention discloses a storage tank edge plate anticorrosion sealing system and a manufacturing method thereof. The method comprises the following steps: preparing materials for manufacturing a sealing structure; cleaning storage tank equipment before sealing; filling non-curing anticorrosion paste into a gap between an edge plate and a cement ring beam to guarantee a wrapping shape to be a gentle slope shape; coating supportive primer onto the upper surface of the edge plate and then attaching a polypropylene cold wrapping tape on the surface of the edge plate and the surface of the cement ring beam along the radial direction of the storage tank, wherein the overlapping width is 50 percent; comprehensively coating curing-type elastic weatherproof sealant above asphalt grout; shaping the curing-type elastic weatherproof sealant to a water scattering slope shape. The anticorrosion sealing system produced by adopting the manufacturing method can be well bonded with the tank wall and the cement ring beam to form a complete anticorrosion sealing system, the elasticity, the weatherproof performance and the anticorrosion capacity are good, and the problem of anticorrosion sealing failure caused by storage tank edge plate deformation and environmental factors can be avoided.