The invention belongs to the field of agricultural devices, and particularly relates to a combined rotary
tillage device, which comprises an upper cross beam mounted on a crawler-type rear axle of an agricultural
machine, and is characterized in that first vertical hydraulic cylinders are fixed on two sides of the upper cross beam, channel steel is horizontally welded on the left side of the upper cross beam, and the first vertical hydraulic cylinders are connected with a lower cross beam through inverted L-shaped rods; horizontal supporting rods are installed on the front side and the rear side of the lower cross beam, a first rotating shaft is arranged on the right side of the lower cross beam and installed between the horizontal supporting rods, a plurality of first discs are installed on the first rotating shaft, and a plurality of rotary
tillage blades are evenly distributed on the first discs along the circle center; the two sides of the top of the protective cover are hinged to the lower cross beam through first arc-shaped rods. The rear combined rotary
tillage device has the beneficial effects that firstly, lifting of the whole rear combined rotary tillage device can be achieved through the first
hydraulic cylinder; secondly, when deep ditches need to be tilled in the field, the
plough can be provided with a longer right blade for
tilling; at the moment, when the stranding cage twists from the two sides to the center and the land is changed into the field, the
plough can take down the blades on the right side for cultivation, when the first field is cultivated, the stranding cage twists from the center to the two sides, and when the second field is cultivated, the stranding cage is taken down.