The invention discloses a trail-type straw collecting, smashing and bundling machine. The machine is composed of a complete machine frame, a collecting, smashing and conveying device, a smashed straw filling device, a straw compacting and bundling device and a power transmission system. The machine well overcomes the technical problems like pre-hydraulic lifting of the collecting, smashing and conveying device, connecting and conveying of vertical and horizontal auger rollers, intermittent and fast and smooth filler dragging, piston-type strong compressing of straw, artificial tying and bundling of stringing driven by hydraulic pressure, adjustment of bundling bale density by clamping a side wall, and removing and top squeezing of straw bundling bales by adopting a plurality of innovative technologies in the aspects of layout and arrangement of overall structure, integration and conformity of functional parts for operation, matching and selection of transmission power, etc. According to the invention, the machine has the outstanding features of advanced technology, reasonable structure, high production efficiency, good operation quality, wide application range, etc.; and the machine is suitable for combined operation of collecting, picking, smashing, conveying, compacting and bundling of straws of crops like standing or spread-or-strip windrowing corns, wheat, beans, sorghum, cotton and oilseed rapes.