The invention discloses a base geopolymer binding agent. At present, a binding agent for a fire-proof door has volatile gas and free formaldehyde, has toxic and harmful substances which exceed the standard seriously, is poor in high-temperature-resistant performance, inflammable, non-water-resistant and poor in temperature variation stability, and is extremely easy to dissolve, scatter and expand. The base geopolymer binding agent is prepared from the following raw materials in parts by weight: 95-105 parts of sodium water glass, 15-35 parts of mineral waste residues, 3-6 parts of calcium carbonate, 8-15 parts of quick lime, 8-15 parts of metakaolin, 0.5-1 part of aluminum triphosphate, 0.5-2 parts of retarder and 1-2 parts of emulsion; the raw materials are stirred and cured to obtain the base geopolymer binding agent. The base geopolymer binding agent disclosed by the invention does not need to add a curing agent, does not need hot-press curing, has the advantages of high strength, chemical corrosion resistance, water resistance, high temperature resistance, durability and the like, also has good flame-retardant and heat-insulation effects, is extremely strong in water resistance, does not have water absorption and swelling phenomenon, and can reach a fireproofing grade of grade A. By virtue of detection, the prepared binding agent disclosed by the invention has a binding strength of more than or equal to 5mPa, is non-inflammable, does not absorb water and moisture, and is non-toxic and harmless.