The invention discloses flame-retardant epoxy grout used for joint filling and leakage stopping. The grout is composed of a component A and a component B which are different in color. The component A comprises, by mass, 80-100 parts of epoxy resin, 4-15 parts of diluent, 50-100 parts of talcum powder, 20-50 parts of aluminum hydroxide, 5-10 parts of gas-phase white carbon black, 50-100 parts of silica powder and 0.1-3 parts of pigment. The component B comprises 40-100 parts of epoxy resin curing agents, 20-50 parts of liquid flame retardant, 50-100 parts of talcum powder, 20-50 parts of aluminum hydroxide, 5-10 parts of gas-phase white carbon black, 50-100 parts of silica powder and 0.1-3 parts of pigment. The grout is easy to prepare and convenient to construct, can be directly and manually kneaded or stirred through a machine, is moderate in operation period, quick in curing, high in strength after curing and good in toughness, and has a good flame-retardant effect.