The invention discloses an ultra-short-focus direct-projection lens with an image distortion counteracting function and an image processing method. The ultra-short-focus direct-projection lens comprises a lens front group, a lens rear group and a reverse deformation device. The lens front group comprises a front group of lenses and a group of curved surface optical lens units. The group of curvedsurface optical lens units comprises at least one lens and at least one curved surface on the lens. The reverse deformation device is used for conducting reverse deformation on the deformation generated by amplification of the curved surface optical lens units. According to the distortion size of an image projected by each lens at a low projection rate, the image needing to the projected is reversely calculated, and distortion happens to the normally-projected image, so the distortion produced by the projection of a physical device is counteracted, the normally-projected image is projected ata low or ultra-low projection rate, the problem of distortion or high processing data calculating amount in the prior art is solved, the image fidelity is greatly improved, and wide application prospects are realized.