The invention discloses a normal-temperature curing flexibility epoxy resin waterproof binder for roads and bridges. The normal-temperature curing flexibility epoxy resin waterproof binder is characterized in that the waterproof binder is prepared from a component A and a component B, the component A is prepared form bisphenol A glycidyl ether epoxy resin, a toughening agent a, namely a rubber toughening agent, and an active diluent, and the component B is prepared form a polyamide curing agent and polyether amine curing agent mixed curing agent, a toughening agent b, namely a reacting toughening agent, and an amine accelerant, wherein the mass ratio of the component A to the component B during using is (100:35) to (100:50). The epoxy resin binder can be cured within 24 hours at the room temperature environment, and has high strength and high elasticity.