The invention belongs to the technical field of plastic modification and processing, and particularly relates to an efficient enhanced type halogen-free flame-retardant functional master batch for direct injection molding of nylon 6 products and a preparation method of the efficient enhanced type halogen-free flame-retardant functional master batch. The functional master batch is formed by combining a mater batch A and a master batch B, the master batch A is prepared from the following materialss in percentage by weight: 50.0-70.0% of glass fibers, 20.0-35.0% of high-flow nylon 6 resin, 3.0-10.0% of maleic anhydride grafted elastic ionomer, 3.0-6.0% of star-shaped nylon 6 resin, and 0.1-0.3% of an antioxidant. Compared with traditional plastic functional master batches, the functional master batch prepared through the method avoids mutual modification efficiency loss caused by mutual shear abrasion of glass fibers and a flame retardant in the processing course of enhanced type halogen-free flame retardant nylon 6 modification systems, and meanwhile solves the problem of mismatched processing temperatures of the two modification systems is solved and remarkably enhances the modification efficiency of the two modification systems is remarkably enhanced; the mater batch has a feature of easy dispersion processing and can be directly and simply mixed with nylon 6 resin according tothe proportion and then subjected to injection molding, and an excellent modification effect can be achieved.