The invention discloses a bidirectional motion estimation device for production of an interpolated frame based on a front reference frame and a rear reference frame, which comprises a storage unit, a matching error calculation unit, a comparator tree unit and a data memory. The storage unit is used for caching data in the front reference frame and the rear reference frame; the matching error calculation unit is used for dividing the interpolated frame into a plurality of macro blocks of the same size, setting a search range based on each macro block, and calculating matching errors corresponding to all motion vectors in the search range; the comparator tree unit is used for comparing all the matching errors calculated in the search area to obtain the minimum matching error and outputting the minimum matching error and a corresponding motion vector; and the data memory is used for storing the minimum matching error and the corresponding motion vector. The full-search bidirectional motion estimation method can be implemented flexibly, and the efficiency of implementation is high; the driving capacity of signals can be improved, the delay of the signals can be reduced, and the signal synchronization can be controlled; the highest efficiency and data multiplexing can be realized; and the bidirectional motion estimation device has higher flexibility and practicality.