NOVELTY - An industrial briquette composite binder comprises 36-60 pts. wt. humic acid, 2-8 pts. wt. sodium hydroxide, 36-60 pts. wt. bauxite, 5-30 pts. wt. modified wood ash, and 25-30 pts. wt. water. The modified wood ash is prepared by soaking 100 pts. wt. ash tree into 10-15% hydrogen peroxide solution, washing with deionized water, soaking into 10-12% sodium hydroxide solution, washing with deionized water until it is neutral, drying, and adding dried ash tree with 2-3 wt.% sodium lauryl sulfate, 10-20 wt.% nano carbon, 2-3 wt.% polyisobutene, and 3-5 wt.% alum powder.    USE - Industrial briquette composite binder.    ADVANTAGE - The composite binder has reduced fixed carbon content, excellent adhesion property, high pelletizing rate, and good thermal stability. The preparation method of the composite binder is simple, short in production period and low in cost.    DETAILED DESCRIPTION - An industrial briquette composite binder comprises 36-60 pts. wt. humic acid, 2-8 pts. wt. sodium hydroxide, 36-60 pts. wt. bauxite, 5-30 pts. wt. modified wood ash, and 25-30 pts. wt. water. The modified wood ash is prepared by soaking 100 pts. wt. ash tree into 10-15% hydrogen peroxide solution for 3-4 hours, then washing with deionized water, soaking into 10-12% sodium hydroxide solution for 3-4 hours, washing with deionized water until it is neutral, drying, adding treated ash tree with 2-3 wt.% sodium lauryl sulfate, 10-20 wt.% nano carbon, 2-3 wt.% polyisobutene, and 3-5 wt.% alum powder, high speed stirring the mixed materials at 1200-1500 revolutions/minute, drying, and crushing into fine powder to obtain the modified ash tree. An INDEPENDENT CLAIM is included for preparation of industrial briquette composite binder, comprising crushing humic acid and sodium hydroxide into powder of more than 60 meshes, mixing and stirring, cooling the mixture, adding bauxite and grinding into 100 mesh powder, adding mixture with modified wood ash and water, stirring, and drying at 90-100 degrees C for 1-2 hours, and discharging to obtain the product.