The invention relates to a positioning device for precisely manufacturing a curve-shaped automobile accessory. The positioning device comprises a platform, a support seat, a position limiting device and a positioning component, wherein the support seat is arranged on the platform, the position limiting device is used for fixing one side of an accessory arranged on the support seat, the positioning component is used for carrying the other part of the accessory, a fixing component is arranged on the positioning component, the support seat comprises two support plates in mutually parallel arrangement, the support plates are used for carrying at least two support strips arranged on the arc-shaped carrying surface of the accessory, the single support strip penetrates through the two support plates at the same time and is projected out of the carrying surface, the positioning component is correspondingly arranged at the upper end of the carrying surface, and the position limiting device is correspondingly arranged at the lower end of the carrying surface. The positioning device has the advantages that through the arrangement of the support strips in the support seat, the positioning problem of automobile accessories in different curves is solved, the efficient and fast positioning is realized, and in addition, the accessory surface can be effectively protected from generating impressions.