Convex lens for common-spherical-surface bifocal vehicle lamp

The invention discloses a convex lens for a common-spherical-surface bifocal vehicle lamp, and comprises a convex lens body, an optical coupling surface is arranged on the inner surface of the lens body, and light emitted by a light source is coupled into the lens body through the optical coupling surface; the outer surface of the lens body is arranged to be a spherical surface, and light coupledinto the lens body is coupled out of the spherical surface. The optical coupling surface of the inner surface of the lens body is divided into an upper half area and a lower half area with the centralaxis of the lens as the longitudinal direction and the horizontal direction as the transverse direction, the lower edge of the upper half area is provided with protrusions and thinned towards the edge, and the lower half area is designed to be a plane. The appearance of an original automobile lamp is not changed; a movement mechanism of the blocking piece is directly omitted, so that when passinglight is changed into dist