The invention relates to a method for preparing a polystyrene/poly 3,4-ethylene dioxygen thiophene conductive macromolecular composite particle. The method is as follows: 3,4-ethylene dioxygen thiophene and polystyrene particle latex are mixed; after the mixture is stirred for a plurality of hours, oxidant is added into the mixture at a temperature of between 50 and 80 DEG C; while stirring, acids are dripped and mixed into the mixture; after reaction for 18 to 24 hours, centrifugal washing by utilization of methanol and water is performed for a plurality of times until the upper layer solution is achromatic; after secondary separation and drying, the polystyrene/poly 3,4-ethylene dioxygen thiophene conductive macromolecular composite particle is obtained; the thickness range of a poly 3,4-ethylene dioxygen thiophene shell is between 50 and 100 nm.