This application discloses a method and an apparatus for lifting video resolution, where an initial magnified signal obtained by performing upsampling on an original signal is decomposed into two parts, that is, a first signal and a second signal by means of forward wavelet transform, where the first signal and the original signal have the same volume, and high-frequency information in the original signal is preserved; then the first signal is enhanced, so that enhancement on the first signal is transferred to the second signal by performing inverse wavelet transform on the second signal and the enhanced first signal, to compensate high frequency loss in the second signal, that is, high-frequency information of an entire final magnified signal obtained through inverse wavelet transform is compensated relative to the initial magnified signal, so that a magnified image corresponding to the final magnified signal can better preserve high-frequency information of an original image, vagueness of the magnified image is reduced or even eliminated, and definition of an entire video is improved.