Embodiments of the present invention provide a multilevel bidirectional motion estimation method and a multilevel bidirectional motion estimation device. This method includes the steps of searching for a matching block in a current frame and a preceding frame by using the M1 to M1 blocks of a frame to be interpolated as a mirror center, respectively, And when determining that the SBAD value of the pair of the first determined scheduled matching block is greater than or equal to the SBAD threshold, divide the M1 to M1 blocks of the interpolation scheduled frame into M2 to M2 blocks, Re-searching for matching blocks in the current frame and the preceding frame, respectively, by using the M2 to M2 blocks of the frame to be interpolated as a mirror center. Therefore, the accuracy of motion estimation can be effectively improved and the image quality can be improved.
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