An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may include obtaining a current block by splitting an image, determining a prediction mode of the current block, generating an intra prediction block of the current block, based on the prediction mode of the current block being an intra prediction mode, generating a residual block of the current block, and reconstructing the current block based on the prediction block and the residual block of the current block.