Large and small rice seedling staggered planting device and method thereof

The invention provides a large and small rice seedling staggered planting device and a method thereof, and belongs to the field of agricultural machinery. The device comprises a crank rocker type transplanting mechanism, a planetary gear train transplanting mechanism, a planting box, a transverse seedling feeding mechanism, a longitudinal seedling feeding mechanism, a seedling transplanting table mechanism and a rack. A seedling transplanting table mechanism of the device is divided into a small seedling transplanting table and a large seedling transplanting table, and under the control of a transplanting box, large and small seedlings are provided for a crank rocker type transplanting mechanism and a planetary gear train transplanting mechanism for transplanting through a transverse seedling feeding mechanism and a longitudinal seedling feeding mechanism respectively. Compared with the prior art, the device has the capacity of planting large seedlings and small seedlings at the same time, the seedling damage