The utility model provides a pixel predicting device based on HEVC. The pixel predicting device comprises a first gating device chip, a first adder chip, a second gating device chip, and a second adder chip. The first gating device chip is used for acquiring the pixel values of nearest neighbor pixel spots of a current prediction unit. The first adder chip is connected with the first gating device chip and is used for filling pixel spots, with unusable pixel values, in the nearest neighbor pixel spots acquired by the first gating device chip with pixel values by using a filling rule. The second gating device chip is connected with the first adder chip and is used for acquiring the pixel values of pixel spots required by prediction from the nearest neighbor pixel spots processed by the first adder chip according to a predicting mode. The second adder chip is connected with the second gating device chip and is used for computing the pixel predicted value of the current prediction unit according to the pixel values of the pixel spots required by prediction and acquired from the second gating device chip and the predicting mode. The pixel predicting device compensates a defect in the prior art, achieves hardware architecture with a few chips, and is very simple in structure and very convenient to use.