A Chinese colza precise combined direct sowing machine

The utility model relates to a precision rapeseed combined direct seeder, which belongs to the technical field of the seeder. The seeder is characterized in that a positive and negative air pressure combined seed metering device and a positive and negative air pressure working unit are installed on the rack, the positive and negative air pressure working unit is composed of a positive and negative air pressure machine, a power transmission device and a supporting frame, wherein the supporting frame is welded on the rack, a main beam, a center beam and a rear beam on the rack are connected into a whole through a side plate and an accessory side plate, a speed change box is fixed in the middle of the main beam, upper and lower suspension arms welded on the main beam form three-point suspension, a seed bed rotary cultivating unit is installed under the main beam, a rotary cultivating straight cutter and a rotary cultivating bent cutter are fixedly welded in a rotary cultivating cutter holder on a rotary cultivat