The invention relates to a sunshade device of an electromobile. The sunshade device comprises a windshield quilt body and a handle cover, wherein the windshield quilt body comprises a middle windshield quilt, an upper windshield quilt, and a two-side windshield quilt; one side of the two-side windshield quilt is fixedly connected with the middle windshield quilt; one end of the upper windshield quilt is connected to the upper edge of the middle windshield quilt, and two sides of the upper windshield quilt are connected to the upper edges of the two-side windshield quilt; the handle cover is arranged at a connecting angle formed by the connection of the upper windshield quilt, the middle windshield quilt and the two-side windshield quilt, and communicates with an inner space formed by the upper windshield quilt, the middle windshield quilt and the two-side windshield quilt; a hard framework is arranged at the connecting position of the upper windshield quilt, the middle windshield quilt and the two-side windshield quilt; one reflective stripe is at the overall edge of the sunshade device, and the other reflective stripe is arranged on the outer side of the middle part of the middle windshield quilt and the two-side windshield quilt; and pockets are separately arranged on the inner side of the upper windshield quilt, the inner side of the middle windshield quilt and the inner side of the two-side windshield quilt. The invention also provides an application method of the sunshade device of the electromobile.