The invention discloses a gluing method for a gluing device of isolating paper of a damping fin, and belongs to the field of machining auxiliary equipment of automobile damping fins. The gluing device comprises an operating table, an isolating paper rolling frame and an aqueous glue barrel, and further comprises a spreading roller and an aqueous glue spreading belt, wherein the operating table is of a micro-downdip structure, and the isolating paper rolling frame is fixed at the bottom of the operating table; the aqueous glue barrel and the spreading roller are fixed to the upper surface of the operating table according to the technology sequence; one end of the aqueous glue spreading belt is fixed at the bottom of the aqueous glue barrel, a material outlet faces toward the aqueous glue spreading belt, and the other end of the aqueous glue spreading belt is fixed to the surface of the operating table of the bottom of the spreading roller; and after the isolating paper is unfolded through the isolating paper rolling frame, the end head penetrates through the bottom of the spreading roller, and the end head of the aqueous glue spreading belt seamlessly makes contact with the isolating paper. According to the gluing method for the gluing device of the isolating paper of the damping fin, the uniformity of aqueous glue spreading is improved, after dried aqueous glue makes contact with the damping fin, the tightness of bonding can be ensured, and the problem of uneasy isolating caused by adhesion and uneven stress of the damping fin due to premature isolation is prevented.