The invention discloses a seed metering device special for taros and belongs to the field of agricultural machines. The seed metering device is composed of a linear track part, a rotating part and a grabbing part. The seed metering device is characterized in that sliding blocks vertically move, power of the sliding blocks comes from the operation that rotating shafts on the top of a taro sowing machine drive cranks, and the cranks and the sliding blocks are connected through rockers; swing rods connected with the sliding blocks can move vertically, the curve sliding block on the leftmost side moves on a curve track, the swing rods are made to swing left and right, the swing rods are connected with scissor-type long rods, the two topmost ends of each long rod are each connected with another curve track through the corresponding curve sliding block, an upper swing frame and a lower swing frame are adopted to support the curve tracks, supporting frames can synchronously swing along with swing of the swing rods through the connection of the three parts and the restriction of the mutual action force, and the two curve sliding blocks move vertically on the curve tracks. By means of the seed metering device, precision seed metering of the taros can be achieved, damage to main buds of the taros in the sowing process is avoided, it can be ensured that the main buds of the taros in soil are upward, and thus the problem that an existing sowing device cannot effectively sow the taros is solved.