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The natural abundance, biodegradability, and low density of plant 昀椀bers, together with biobased epoxy thermoset resin, have driven the increasing popularity of plant 昀椀ber/polymer composites (PFRPs) to wider applications in various industries. However, the striving for biomass-based 昀氀ame retardants (FRs) treatment for PFRPs remained a bottleneck due to polymers’ inherent vulnerability against 昀椀re and the increasing environmental awareness. In this work, a facile two-step aqueous solution coating process was proposed for fabric surface treatment of 昀氀ax fabric using fully biobased phytic acid and chitosan from polysaccharides. The treated 昀氀ax fabric demonstrated self-extinguishing behavior when ignited and showed a decrease in peak heat release rate (PHRR) by 58% under combustion. The laminate produced by this treated 昀氀ax fabric and biobased epoxy resin showed a decrease of PHRR by 36% and an increase of more than 200% for the time of torch 昀椀re burn-through, demonstrating intriguing 昀氀ame retardance brought by only FRs treatment on 昀氀ax fabric reinforcements. Various measurements were done to elaborate on the role of treated 昀氀ax fabric in the 昀氀ame retardancy of polymer composites.