Provided are a video encoding/decoding method and apparatus. According to the present invention, a video decoding method comprises the steps of: obtaining prediction information of a current block from a bitstream; and generating a prediction block of the current block by performing prediction on the basis of the prediction information, wherein the prediction information includes split prediction information of the current block, and the step of generating the prediction block comprises the steps of: obtaining a reference sample from a neighboring block of the current block; applying an interpolation filter to the reference sample; and generating the prediction block by using the reference sample to which the interpolation filter is applied. The interpolation filter may be determined on the basis of the split prediction information of the current block.