The invention discloses a method for implementing an intra-frame sub-block predictor circuit for a video encoder. The method comprises the following steps of: mapping each encoding functional block of the intra-frame sub-block predictor circuit of the video encoder which is described by a high-level program language algorithm into hardware logic description consisting of arithmetic operator units; and generating a hardware integrated circuit of the intra-frame sub-block predictor circuit by the hardware logic description consisting of the arithmetic operator units. The invention also discloses the intra-frame sub-block predictor circuit of the video encoder, which comprises a calculation encoding functional block for calculating predicted values, a selection encoding functional block for selecting the optimum predicted value from the predicted values and a residual calculation encoding functional block for acquiring the sum of corresponding residual calculation matrix element absolute values according to the optimum predicted value. By the circuit and the method, the efficiency of hardware design is improved.