This utility model relates to the field of sports jacket technology, and more particularly to a highly supportive elastic sports jacket. A highly supportive elastic sports jacket includes a jacket body made of elastic fabric, sleeves connected to both sides of the jacket body, and a hood connected to the upper side of the jacket body. A zipper is provided on the front of the jacket body, and symmetrically arranged constricting curves are provided on both sides of the zipper. These constricting curves have an outward arc at the chest area. The constricting curves of this utility model are located on both sides of the zipper, and have an outward arc at the chest area. Combined with the elastic fabric, when a female user wears this jacket, the elastic fabric stretches at the chest area, reducing the supportive fit. By adding constricting lines of a certain strength at corresponding positions on both sides of the chest, an inward supporting force is applied to prevent the chest from spreading outward and maintain the shape of the chest.