The invention relates to a method for surface function modification of meta-aramid fabric and belongs to the technical field of spinning. The method comprises steps as follows: the meta-aramid fabricis treated by a modification liquid formed by DMAc (N,N-dimethylacetamide), LiCl and inorganic functional nanoparticles through blending under the low-temperature and positive-pressure conditions, macromolecules of a fiber surface layer of the fabric reacts with DMAc and LiCl, and a slightly soluble layer is formed; the inorganic functional nanoparticles on the fiber surface are squeezed into theslightly soluble layer under the action of positive pressure, then, DMAc in the slightly soluble layer volatilizes and dissociates under the high-temperature and negative-pressure conditions, the inorganic functional nanoparticles are immobilized on the surface layer of meta-aramid fiber, and functions such as flame retardance, static electricity prevention, radiation resistance and the like of the meta-aramid surface layer are enhanced. Function modification efficiency and durability of flame retardance, static electricity prevention, radiation resistance and the like of the meta-aramid surface layer are effectively improved on the premise that the fiber main body structure is not damaged and the mechanical property is not obviously reduced. By means of the method, no sewage is produced and the production cost is reduced.