The invention discloses a high-efficiency fixation fabric deepening agent, and belongs to the field of textile chemicals. According to the high-efficiency fixation fabric deepening agent, sodium algaacid and gelatin are cross-linked to form a cross-linked network, then oxidation is performed by using an additive to form a hemiacetal structure, thereby improving the fixation effect, polyether amine, lauric acid and organosilicone are added to prepare a block type silicone oil component, thereby reducing the static friction coefficient of a fabric, improving the softness, fineness and smoothness of the fabric and improving the affinity for dyestuff; oleic acid, polyethylene wax and the like are taken as raw materials to prepare a polymer, the polymer and polyethylene glycol are subjected toa condensation reaction to form a block polymer, thereby improving the surface water-absorbing quality, reducing the surface specific resistance, improving the anti-static capacity, changing the electronegativity of the surface of the fabric, and increasing the dyeing degree and the fixation rate, and <->SH introduced to added mercaptoethanol and <->OH contained in the system can synergize to improve the affinity of the fabric for the dyestuff, thereby improving the fixation effect. The high-efficiency fixation fabric deepening agent solves the problems of poor fixation improvement and deepening effect of a currently common fabric deepening agent.