The invention discloses an intra-frame 4*4 forecasting model selection method based on transform domain information, comprising the following steps of: (1) carrying out each-mode forecasting under intra-frame 16*16 and SATD (Sum of Absolute Transformed Difference) generation to a luminance macro block, selecting the mode with a minimum SATD value as the optimum forecasting mode under intra-frame 16*16 and obtaining the value of the optimum forecasting mode, when the mode 2 SATD generation under intra-frame 16*16 is carried out, modifying the traditional Hadamard transform processing method for each4*4 subblocks, extracting the direction information of each 4*4 subblock from the intermediate result and then carrying out edge-direction histogram statistic to the direction information to obtain acandidate mode set, and only searching in the range of the candidate mode set when carrying out intra-frame 4*4 forecasting model selection; (2) respectively carrying out intra-frame 4*4 forecasting model selection to each the 4*4 subblock of the luminance macro block to obtain the optimum forecasting mode and the value of the luminance macro block under intra-frame 4*4; and (3) comparing the value of the optimum forecasting mode under intra-frame 16*16 with the value of the optimum forecasting mode under intra-frame 4*4 to select the optimum forecasting mode of the luminance macro block.