Ultra-short-focus projection lens

The invention discloses an ultra-short-focus projection lens which comprises a DMD chip and further comprises a plurality of coaxially-arranged lenses which are located between a projection face and the DMD chip. The first aspheric lens, the flat concaved lens, the crescent lens, the flat convex lens, the second aspheric lens, the first double-bonding lens, the first convex lens, the second double-bonding lens, the second convex lens and a field lens are sequentially arranged from the projection face and the DMD chip. The DMD chip is arranged in a biasing mode relative to an optical axis, the biasing placing distance is 0.9 mm to 1.0 mm, the DMD chip is 0.65 inch, and the resolution ratio is 1920*1080. The first aspheric lens is a plastic even curve lens, and the second aspheric lens is an even curve plastic rubber lens. According to the high-resolution ultra-short-focus projection lens, the field of view is 120 degrees, the distortion is smaller than 2 percent, the projection ratio is 0.45, and the focal length is 6.8 mm. The ultra-short-focus projection lens is simple in structure and free of special materials.