Flame-retardant monofilament is a chemical fiber product produced by adding flame retardant to the chemical fiber spinning process. At present, phosphorus-based flame retardants (red phosphorus, phosphoric acid esters and halogenated phosphoric acid esters, etc.) are mainly added in the spinning process. The product is characterized by self-extinguishing and difficult to ignite. The flame retardant effect depends on the addition of resistance during the spinning process. The amount of fuel, but generally not higher than 16%.