The invention belongs to the technical field of agricultural tillage whole machinery, particularly relating to a rotary-cutting and turning type ploughing in green device of green manure, which comprises a rotary soil-cutting unit and a soil discharging and green burying unit, wherein, the rotary soil-cutting unit and the soil discharging and green burying unit are mounted with a certain angle therebetween; the rotary soil-cutting unit comprises two side cutters and a transverse cutter which is Y-shaped and the included angle of which is not larger than 170 degrees; and the soil discharging and green burying unit comprises two lateral plates and a top roll. The device is suitable for the ploughing in green operation of milk vetch, hairy vetch, common vetch, white clover, red clover and other green manure crops. Particularly, the rotary soil-cutting unit can cut the soil on which green manure crops grow into rectangular furrow slices, the furrow slices are turned over by 180 degrees under the auxiliary action of the soil discharging and green burying unit, thereby the green manure crops are buried into the soil, the spreadability of ploughing in green of the green manure is good, thereby the use ratio of the green manure is greatly improved.