Ditching rotary tillage cutter assembly and miniature ditcher

The ditching rotary tillage tool assembly comprises a tool rest base cylinder, the tool rest base cylinder is arranged on a rotating shaft of the ditching machine in a penetrating mode through the bottom of the tool rest base cylinder, and a first tool plate and a second tool plate which extend outwards are symmetrically arranged at the open end of the tool rest base cylinder. The first cutting board and the second cutting board are both perpendicular to the axial direction of the tool rest base cylinder, the two side faces of the first cutting board are each provided with a ditching blade, one side face of the second cutting board is provided with two ditching blades, and the other side face of the second cutting board is provided with two rotary tillage blades. The miniature ditching machine comprises a frame, a rotating shaft and a power mechanism used for driving the frame and the rotating shaft to rotate synchronously are arranged on the frame, and a plurality of ditching rotary tillage cutter assemblies