The invention discloses a fame-retardant polyester material with a high glow wire ignition temperature and a preparation method thereof. The flame-retardant polyester material with a high glow wire ignition temperature is composed of the following components in parts by weight: 100 parts of polyester resins, 15-50 parts of bromine-series flame retardant, 5-20 parts of synergistic flame retardant, 0-20 parts of toughening agent, 0-80 parts of carbon forming agent, 5-40 parts of hot oxygen barrier agent, 0-120 parts of fibrous reinforcing agent and 0-10 parts of processing aid. The preparation method of the flame-retardant polyester material with a high glow wire ignition temperature comprises: drying the polyester resins, mixing with other components to obtain a premixed material, then feeding the premixed material into a twin-screw extruder, melting and plasticizing, kneading and mixing, extruding, drawing, cooling, pelletizing, drying and finally packaging. The flame-retardant polyester material with a high glow wire ignition temperature has the advantages of low cost, high glow wire ignition temperature, similar mechanical strength to ordinary flame-retardant polyester and wide application range.