The invention relates to a method for improving an interaction force among microfibers in an aramid fiber and in particular relates to a method for guaranteeing liquid crystal performance of a fluid and obtaining a spinning fluid with a certain disorder degree through trace copolymerization and preparing a fiber with an interaction force among microfibers in a spinning process. A destructional form of the aramid fiber is slippage of the microfibers, thus mechanical properties of the aramid fiber can be improved by improving the interaction force among microfibers; the interaction force among the microfibers of the aramid fiber is controlled by phase transformation in a liquid crystal spinning solidification process; trace copolymerization does not change behaviour of liquid crystals and a liquid crystal spinning process, and regularity among molecular chains of the liquid crystals is destroyed, so that the disorder degree of the liquid crystals is increased; micro crystals in a certain disorder degree change the interaction force among the microfibers, so that strength and modulus of the fiber are increased. The method for improving the interaction force among the microfibers in the aramid fiber is simple, and the aramid fiber with good stability and good mechanical properties can be obtained by adopting a dry spray-wet process liquid crystal spinning moulding method.