Abstract: In order to promote the forage and fertilizer application of crop straw, a movable bag-type straw bale bagging machine was developed in this paper to meet the requirements of straw bale filling after harvest. The designed bag-type straw bale bagging machine was composed of bale pushing mechanism, bag supporting mechanism, transmission system and hydraulic system. The key structural parameters of each mechanism were determined through the overall design and analysis of the straw bale filling process. The prototype test results showed that the productivity was 22.19t/h, the oil consumption per ton of straw was 0.213kg/t, and the damage rate of filling bag was 0.225% under the conditions of frame tilt angle of 3.26°, straw bale pushing speed of 0.15m/s, and straw bale size of Φ1000×1250mm（the bale mass was 107.6kg）. During the operation of the machine, the straw bale continuously loaded was loaded into the bag mouth under the action of push mechanism and bag supporting mechanism and gently falled to the ground under the action of the tilt angle adjustment mechanism of the frame. The filling machine moved forward under the push reaction force to realize the straw bale filling cycle operation.