The utility model provides a free-form surface lens for a projection-type light-emitting diode (LED) automobile dipped headlight. The free-form surface lens is composed of two surfaces, wherein a first surface is a circular flat surface, and a second surface is a free-form surface. According to the refraction law, a normal vector of a point on the free-form surface is obtained, a tangent plane is obtained by using the normal vector, a coordinate of the point on the free-form surface is obtained by determining the intersection point of the tangent plane and light rays which are refracted by the first surface of the lens and then are incident to the free-form surface of a next point, the next point is obtained by intersecting of a straight line of the tangent plane of a preceding point and a straight line of the normal vector of the next point, the coordinates of all the points of a curve of the free-form surface on a coordinate plane are obtained by iterating, the obtained point coordinates are fitted to form the curve and then are rotated by 360 degrees around a Z-axis, and a final lens free-form surface is obtained. By means of the free-form surface lens for the projection-type LED automobile dipped headlight, the direction and the distribution of the light rays are controlled through the free-form surface of the lens, and so that a light area can meet the requirements of light distribution and illumination of the automobile dipped headlight by a national standard.