Combined harvesting device for partially cutting corn straw into sections and returning corn straw to field

The invention relates to the technical field of agricultural machinery, in particular to a corn straw partial cutting and returning combined harvesting device. Comprising a machine body and a section cutting device located at the rear end of the advancing direction of the machine body, a plurality of guide plates are arranged in front of the machine body, and a storage and recovery device is arranged in the middle of the machine body; the storage and recovery device comprises a cutting part for cutting straws, a guiding and conveying part for conveying the straws and an annular cutting and collecting part for crushing and recovery which are sequentially arranged in the forward direction; the corn straw partial cutting and returning combined harvesting device is provided, in the advancing process, bottom straw cutting and returning and upper straw recycling operation can be achieved at the same time, the proportion requirement for straw returning and the requirement for cutting and returning are met, and the o