The invention relates to an antifouling color-retention modified epoxy crack sealer. The invention is characterized in that the crack sealer is composed of a component A and a component B. The component A comprises an epoxy resin, an inorganic filler, a pigment, a diluter, a dispersing agent, coupling agent, a defoaming agent and an anti-yellowing agent. The component B comprises organosilicon modified amine, a polyetheramine curing agent, an accelerator, a coupling agent, a pigment, an inorganic filler, a dispersing agent, a flowability regulator and an anti-yellowing agent. The organosilicon modified amine is synthesized from alicyclic amine and epoxy-terminated silicone oil. The colorant is composed of a main material sintered colored quartz sand and an auxiliary material lightproof heat-resistant organic pigment. The crack sealer has the advantages of favorable pollution resistance and excellent color retention property.