The invention belongs to the technical field of electron beams, particularly relates to an electron beam paint quick-drying device and a use method thereof, and provides the following scheme aiming at the problems of low paint curing efficiency and poor durability when paint is subjected to quick-drying treatment in an existing UV curing mode: the electron beam paint quick-drying device comprises a supporting base, and a gantry bracket is fixedly arranged at one end of the supporting base; a plurality of equidistant mounting grooves are formed in the inner wall of the gantry support, mounting shells are arranged on the inner walls of the mounting grooves, an automobile shell is arranged in an annular opening of the gantry support, electron beam sources are arranged on the inner walls of the adjacent ends of the mounting shells, and electron beams are reflected by the electron beam sources. According to the invention, when electron beams bombard the surface of the paint, a specific chemical reaction can be generated, so that the paint is rapidly cured, and compared with UV curing and electron beam curing in the current market, the method has the advantages of high efficiency, stronger durability and more environmental protection.