The invention relates to a cotton boll combine harvester. The cotton boll combine harvester comprises a rack (6), a picking device (9), a power control device (1), a first-level conveying device (2), a second-level conveying device (4), a separation device (3), a lifting material box (5) and a cotton stalk recycling device (7), wherein the picking device (9) is arranged at the front end of the rack (6), and is connected with the rack (6) through a gap bridge (8), the separation device (3) is arranged on the top of the middle of the rack (6), the first-level conveying device (2) is installed between the picking device (9) and the separation device (3), the lifting material box (5) is installed on the rear portion of the rack (6), the second-level conveying device (4) is installed between the separation device (3) and the lifting material box (5), and the cotton stalk recycling device (7) is installed at the bottom of the middle of the rack (6). Compared with the prior art, the cotton boll combine harvester can accomplish various types of operation including cotton boll picking, conveying, separation, material collection and cotton stalk recycling at one time, the farming season is ensured, the phenomenon that operation is busy is eliminated, efficiency is high, energy consumption is low, the investment is small, and particularly, compared with single operation, the frequency of the cotton boll combine harvester for entering the field is reduced, and damage to the soil structure is reduced.