The invention provides a modification method of high-performance organic fibers and modified high-performance organic fibers. The method for modifying the high-performance organic fibers is used for modifying the high-performance organic fibers by adopting a compound with a structure shown as a formula I; the formula I is as follows: the formula is shown in the description. According to the methodprovided by the invention, original tensile strength of the high-performance organic fibers is kept and the compression strength is greatly improved; furthermore, the method has good commonality, simple modification technology and low equipment requirements; the production efficiency is not obviously influenced while the compression strength is improved; and the method has remarkable economic application value.