Binding agent with high fire resistance

The invention relates to a binding agent with high fire resistance. The binding agent comprises components in parts by weight as follows: 5-50 parts of an epoxy resin 100 reactive diluent, 5-35 parts of a fire retardant and 4-15 parts of a curing agent, wherein the fire retardant is polyphosphate/magnesium hydrate nano-composite particles. The polyphosphate and most of base materials have good binding force through the polyphosphate/magnesium hydrate nano-composite particles, good compatibility is achieved between the polyphosphate and a resin system at the same time, and certain fire resistance is also achieved. Under the system, as the fire resistance is improved, certain binding strength can be guaranteed.