The present invention is wood fire retardant and wood fire retarding treatment process. The wood fire retardant is compounded with ammonium sulfate 5-65 wt%, diammonium hydrogen phosphate 5-65 wt%, boric acid 5-65 wt% and borax 5-65 wt%, and through mixing in a mixer. The wood fire retarding treatment process includes the following steps: compounding fire retardant liquid with the wood fire retardant in 10-20 wt% and water, vacuumizing the soaking pond, conveying the fire retardant liquid via high pressure pump to the soaking pond to soak wood until reaching saturation state, and drying. Thus treated wood can reach highest wood fire retarding grade. |