The invention provides an intra-frame prediction pixel generation method and device. The intra-frame prediction pixel generation method comprises the following steps: firstly, according to an intra-frame prediction mode adopted by a current block and the position of a current predicted pixel in the block, determining the position of a reconstructed pixel corresponding to the predicted pixel whichis obtained by the predicted pixel according to a directional prediction mode; then, performing calculation in combination of the reconstructed pixel position to obtain reconstructed pixel offset corresponding to the predicted pixel; taking the reconstructed pixel position and the reconstructed pixel offset as a reference reconstructed pixel position for the predicted pixel; or, carrying out precision control of specified sub-pixel precision on the reconstructed pixel offset to obtain approximate offset meeting specified sub-pixel precision requirements; taking the reconstructed pixel positionand the approximate offset as a reference reconstructed pixel position for the predicted pixel; finally, copying a pixel value of the reference reconstructed pixel position as a prediction value of the predicted pixel. According to the method and the device provided by the invention, the problem of cross-projection plane texture deflection is solved.