Flame-retardant polyurethane repair adhesive and repair method

The invention relates to a flame-retardant polyurethane repair adhesive and a repair method. The flame-retardant polyurethane repair adhesive comprises a polyurethane prepolymer, a chain extender and a primer which are independently packaged, the chain extender comprises solid amines playing a crosslinking role, liquid amines playing a crosslinking role, a polyurethane catalyst, a defoaming agent, a flame retardant and ethyl acetate; the mass ratio of the chain extender to the prepolymer is (25-45): 100. The repairing method comprises the following steps: polishing the rubber surface, dissolving trichloroisocyanuric acid urea in ethyl acetate, smearing the mixture on the rubber surface, coating the primer, uniformly mixing the chain extender with the prepolymer, and pouring. The operation waiting time for repairing the conveying belt can be shortened, and standby consumption is reduced; the chain extender reacts with the polyurethane prepolymer to generate polyurethane, and the service life can be prolonged a